Basic concepts: molecular biology, DNA, RNAs, chemical bonds, importance of water, chemical reactions, organic compounds, carbohydrates, lipids, cholesterol, proteins, amino acids, fats, steroids, emulsifiers, etc.

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Biology 205 (BIOL 205-UCAL) Midterm III

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Question 1

Which of the following statement is incorrect about RNA? (ID-B03-42)

A	Only the tRNA structure is linear.
B	The tRNA carries amino acids with high energy bound for making proteins.
C	Coding of the proteins is done by mRNAs.
D	Only the mRNA structure is linear.

Question 2

Which of the following statement is true about monosaccharides? (ID-B03-25)

A	They often form ring structures.
B	Their molecular formulas are usually multiples of CH2O2.
C	Most common two; glucose forms 5 membered structures while fructose forms 6 membered structure.
D	They usually characterized by three double bonded C-O structures.

Question 3

Iodine (I) is an essential trace element used to produce hormones by which gland? (ID-B03-06)

A	Pituitary gland
B	Salivary gland
C	Pineal gland
D	Thyroid gland
E	Prostate gland

Question 4

DNA is made in a process called __I__ while RNA is made in a process called __II__. (ID-B03-24)

A	I. transcription II. replication
B	I. replication II. transcription
C	I. replication II. translation
D	I. transcription II. translation
E	I. translation II. replication
F	I. translation II. transcription

Question 5

Which of the following statement is true about biological cells? (ID-B03-51)

A	Both animal and plant cells contains materials that move around (mobile).
B	Natural carbon is only produced by plant cells.
C	Biological cells have the ability to differentiate Carbon-12 from Carbon-14.
D	Only the animal cells that have materials that move around (mobile).
E	Majority of organic cells lacks nucleus.

Question 6

Chemically why water is important to life? (ID-B03-14)

A	The chemical properties such as high cohesion and polarity.
B	Very high electron transfer rate and high electrical conduction rate.
C	Very high reaction rate.
D	The physical properties such as very low angles between the two H-atoms and the O-atom.

Question 7

The fimbriae of a typical prokaryotic cell has what purpose? (ID-B03-60)

A	Facilitate active transport and diffusion.
B	Attaching to host surfaces.
C	Isolation from the outside; like a cell wall.
D	Locomotion.

Question 7 Explanation: 

It is composed of β-sheet type proteins with a sticky end.

Question 8

Which of the following statement is correct about saturated fats? (ID-B03-43)

A	They have kinks caused by double bonding of carbon atoms.
B	They are often found in olive oil and vegetable oils.
C	They have the maximum number of hydrogens (alkanes) in the fats and lipid group.
D	Compared to unsaturated fatty acids, they have a very high melting point.

Question 9

If you want to increase the internal temperature of Canadian moose dung while cooking, what should you do? (ID-B03-16)

Note: Moose dung is a traditional Canadian delicacy. Yum yum 🙂

A	Decrease the humidity of the cook pot.
B	Freeze the dung before cooking.
C	Increase the humidity of the cook pot.
D	Add salts, ionic compounds, to the moose dung.

Question 10

A solution at pH 6 contains ___ than the same amount of solution at pH 4. (ID-B03-20)

A	100 times less H+
B	2 times more H+
C	100 times more H+
D	10 times less H+
E	10 times more H+

Question 10 Explanation: 

pH = -log₁₀[H⁺]
[H⁺] = 10^-pH

Question 11

Which of the following is the functional group of fatty acids? (ID-B03-90)

A	Hydroxyl group
B	Carbonyl group
C	Carboxyl group
D	Phosphate group
E	Amino group

Question 12

Cells are the simplest collection of matter that can live. We use microscopes to study them. Which microscope would you use if you were to study intracellular structures? (ID-B03-52)

A	Scanning Electron Microscope (SEM)
B	Light Microscope (LM)
C	Transmission Electron Microscope (TEM)
D	Electron Microscope (EM)

Question 13

What is the function of mitochondria in animal cells? (ID-B03-61)

A	Provide structural support for the cell wall.
B	Genetic control of the cell.
C	Manufacture and distribution of molecules.
D	Provide structural support for the nucleus.
E	Energy processing.

Question 13 Explanation: 

In plants, this function is carried out by chloroplasts.

Question 14

Which of the following components/substances are present in Red Blood Cells (RBCs)? (ID-B03-88)

A	Ribosomes, plasma membrane and hemoglobin.
B	Plasma membrane and hemoglobin.
C	Ribosomes, organelles and hemoglobin.
D	Nucleus, ribosomes and hemoglobin.
E	Nucleus, plasma membrane and hemoglobin.

Question 14 Explanation: 

Red Blood Cells do not have nucleus, organelles or ribosomes.

Question 15

What is the most abundant organic compound on Earth? (ID-B03-31)

A	Starch
B	Chitin
C	Lipids
D	Glycogen
E	Cellulose

Question 16

There are ___ elements essential to life and the four most abundant includes hydrogen, oxygen, carbon and ___. (ID-B03-01)

A	15 , sodium
B	22 , sodium
C	22 , iron
D	25 , nitrogen
E	15 , nitrogen
F	15, iron

Question 17

You take a spoon full of cocoa powder and mix it in milk. Assuming no isolated reactions occurred, which of the statement is most likely describes your cocoa milk shake? (ID-B03-17)

A	The mixing of the two most likely have broken down the molecular bounds of water and that resulted in reaction with cocoa powder.
B	The temperature of the mixture should have increased as the mixing progresses.
C	The milk acted as the solute which breaks down the chemical compounds in the cocoa powder.
D	Milk is the solvent while cocoa powder is the solute.

Question 18

Association of multiple polypeptides are often found in what level of protein structure? (ID-B03-37)

A	Tertiary structure
B	Primary structure
C	Secondary structure
D	Quaternary structure

Question 19

An unknown element has 6 protons and 8 neutrons. Which of the following element is most likely fit this atomic description? (ID-B03-05)

A	Nitrogen-12
B	Carbon-12
C	Carbon-13
D	Helium-4
E	Carbon-14

Question 19 Explanation: 

By calculating the atomic mass number with the given data, the ONLY possible answer is Carbon-14.

Question 20

Why dissolution of CO₂ in ocean water result in ocean acidification? (ID-B03-77)

A	Because CO2 reacts with calcium to produce bicarbonate.
B	Because CO2 acts as a low pH buffer.
C	Because CO2 reacts with water to produce carbonic acid.
D	Because CO2 is an acid.

Question 21

What is good for human health? (ID-B03-47)

A	A very high LDL to HDL ratio.
B	More cholesterol within the lipoprotein, hence away from the blood.
C	A very low LDL to HDL ratio.
D	More triglycerides within the lipoprotein, hence away from the blood.

Question 21 Explanation: 

Medical professionals do not measure the LDL or HDL levels when testing for cholesterol. They test the ratio of LDL/HDL. HDL is good for health and therefore lower the ratio, even if it very high, better it is for the body.

Question 22

Living cells have the amazing ability to distinguish different isotopes of the same element. (ID-B03-09)

A	True
B	False

Question 23

Hydrogen ion (H⁺) and hydroxide ion (OH^-) are highly reactive. They play a major role in what process? (ID-B03-19)

A	Hydrogen bonding
B	Vital hormone producing reactions
C	Acid-base reactions
D	Chemical precipitation reactions

Question 24

All of the following chemical groups are hydrophilic except, (ID-B03-22)

A	Methyl group
B	Carboxyl group
C	Phosphate group
D	Hydroxyl group
E	Carbonyl group
F	Amino group

Question 25

Which of the following hydrocarbon that has a cyclic (ring) structure? (ID-B03-78)

A	Methane
B	Butane
C	Ethane
D	Benzene

Question 26

Organic chemical reactions takes place... (ID-B03-76)

A	...by heating the reactants.
B	...only by breaking covalent bonds because living cells cannot break down ionic bonds.
C	...always outside cell walls.
D	...in aqueous environment of cells.

Question 27

The ___ is the site where ribosomal RNA (rRNA) is transcribed and where ribosomes are assembled. (ID-B03-74)

A	Centriole
B	Vesicles
C	Rough endoplasmic reticulum
D	Golgi apparatus
E	Nucleolus

Question 28

Which of the following integral membrane protein in Red Blood Cells (RBCs) provide gel-like barrier outside the cell? (ID-B03-89)

A	Spectrin protein
B	Ankrin protein
C	Band 3 protein
D	Aquaporins protein
E	Glycophorin protein

Question 29

Which of the following statement is correct about microfilaments in the cytoskeleton? (ID-B03-68)

A	They are only found in plant cells because animal cells with movement cannot maintain the structure.
B	They are composed of globular proteins that are assembled and disassembled in different regions of the cell to form hollow pathways.
C	They made the various fiberous proteins of α-helical coiled-coils that transport materials from one area to another.
D	They are composed of action and involved in cell movement and maintaining cell structure.

Question 30

The surface tension of water is vital to organisms. Why does water has high surface tension? (ID-B03-50)

A	The hydrogen bonds.
B	Low radioactivity and polarity.
C	The very high electronegative nature of the molecule.
D	The high atomic mass.

Question 31

How many different nitrogenous bases that made up of DNA structures? (ID-B03-39)

A	6
B	3
C	5
D	4
E	2

Question 32

Communication between cells is maintained through allowing molecules to flow by what type of cell junctions? (ID-B03-67)

A	Tight junctions
B	Membrane junctions
C	Anchoring junctions
D	Gap junctions
E	Messenger junctions

Question 33

What is the function of flagella on prokaryotic cells? (ID-B03-59)

A	DNA and RNA replication.
B	Provide structural support.
C	Enzyme and proteins synthesis.
D	Protection from the outside environment.
E	Locomotion.

Question 34

How is lipids different from other large biological molecules? (ID-B03-29)

A	They are nonploar and therefore hydrophilic.
B	They can form many different shapes with random orientations.
C	They do not form polymers.
D	They are the largest biological molecules.

Question 35

Which of the following class of biological molecules is responsible for the structure of water insoluble membranes? (ID-B03-23)

A	Nucleic Acids
B	Lipids
C	Proteins
D	Carbohydrates

Question 36

Atoms are split/sub-divided into how many subatomic particles? (ID-B03-07)

A	Three subatomic particles.
B	Hundreds of subatomic particles.
C	Two subatomic particles.
D	Five subatomic particles.

Question 36 Explanation: 

Although we have identified more than hundreds of subatomic particles, there are three important ones; Protons, Neutrons and Electrons. Read more at Wikipedia

Question 37

Cell walls of bacteria is made up of what material? (ID-B03-63)

A	Glucose
B	Peptidoglycan
C	Chitin
D	Flagella

Question 38

How is nitrogenous bases of RNA differ from that of DNA? (ID-B03-38)

A	RNA has Thymine (Thy) nitrogenous base instead of Adenine (Ade).
B	RNA has Uracil (Ura) nitrogenous base instead of Thymine (Thy).
C	RNA has Guanine (Gua) nitrogenous base instead of Cytosine (Cyt).
D	RNA has Thymine (Thy) nitrogenous base instead of Cytosine (Cyt).
E	RNA has Cytosine (Cyt) nitrogenous base instead of Adenine (Ade).
F	RNA has Adenine (Ade) nitrogenous base instead of Cytosine (Cyt).

Question 39

What is the primary function of RNAs? (ID-B03-45)

A	Carry information of amino acid sequence from the genes to make proteins in cells.
B	Develop new genetic codes for evolutionary adaptations.
C	Provide energy for the DNA structure by converting energy from cells into ATP and transferring it to the nucleus.
D	Protect the nucleus from genetic mutations, even though this always does not work.

Question 40

What are the general parts of a nucleotide? (ID-B03-83)

A	3-carbin sugar, phosphate group and a adenine
B	5-carbin sugar, phosphate group and a nitrogenous base
C	5-carbin sugar, phosphate group and a adenine Hint: While it is true a adenine can be one, it is not a general part!
D	3-carbin sugar, phosphate group and a nitrogenous base

Question 41

What theory state that mitochondria and plastids, including chloroplasts, originated as prokaryotic cells engulfed by a host cell? (ID-B03-85)

A	Cell theory
B	Genetic theory
C	Endosymbiont theory
D	Theory of inheritance

Question 42

What is the difference between temperature and heat? (ID-B03-15)

A	Heat is produced through instantaneous reactions such as boiling water. Temperature is the quantitative measurement of heat.
B	Temperature is a long term quantitative measurement of energy while heat is a short term measurement of energy.
C	Temperature is the amount of energy associated with movement of atoms while heat is the intensity of heat (average speed of atoms).
D	Heat is the amount of energy associated with movement of atoms while temperature is the intensity of heat (average speed of atoms).

Question 43

Why do manufactures use corn syrup derive fructose over glucose? (ID-B03-80)

A	There is more fructose naturally in corn syrup.
B	Fructose is sweeter than glucose.
C	Fructose is a polymer while glucose is a monomer.
D	Fructose is cheaper than glucose.

Question 44

Arrange the following chemical groups diagrams from Hydroxyl, Carbonyl, Carboxyl, Amino, Phosphate and Methyl in that order. (ID-B03-75)

Suggestion: Take your time to answer this question. It can be confusing with 6 types!

A	VI , IV , II , V , III and I
B	IV , VI , III , II , V and I
C	VI , IV , III , II , V and I
D	I , III , IV , V , II and VI
E	IV , I , VI , V , II and III
F	IV , VI , II , III , V and I

Question 45

What criterion is used to classify an element as "trace element" in humans by Biologists? (ID-B03-71)

A	The elemental abundance must be less than 0.1% of the human body weight.
B	The elemental abundance must be less than 0.2% of the human body weight.
C	The elemental abundance must be less than 0.4% of the human body weight.
D	The elemental abundance must be less than 0.01% of the human body weight.
E	The elemental abundance must be less than 1.0% of the human body weight.

Question 46

Fundamentally, functions of proteins are determine by... (ID-B03-32)

A	...their orientation of the hydrogen atoms.
B	...their chemical structures.
C	...water solubility level.
D	...the type of translation.

Question 47

What is the difference between a compound and a molecule? (ID-B03-02)

A	Molecules composed of two or more different elements while compounds composed of two or more atoms.
B	Compounds composed of two or more different elements while molecules composed of two or more atoms.
C	All organic matter is compounds while molecules are inorganic.
D	Molecules are always ionic while compounds could be either ionic or covalent.
E	Molecules easily react with organic matter therefore they often involved in chemical reactions. Compounds are stable entities and are often inert.

Question 48

What is the major function of phospholipids? (ID-B03-46)

A	Synthesis of Amino acids, DNA and RNA.
B	Energy storage and release.
C	Forms cell membranes.
D	Signaling molecules for sex hormones.

Question 49

Which of the following statement is correct about vacuoles in Endomembrane System? (ID-B03-70)

A	They process materials and produce usable energy for eukaryotic cells.
B	In plants, they store toxins to protect them from predators.
C	In humans, they acts as the digestive compartments within cells.
D	They are the transport vesicles that deliver glycoprotein from ER membrane to Golgi apparatus.

Question 50

All living things are composed of cells and that all cells come from other cells. What is this statement describing? (ID-B03-84)

A	Cell theory
B	Molecular theory
C	Genetic theory
D	Theory of evolution
E	Laws of inheritance

Question 51

Fats come from animals are generally... (ID-B03-44)

A	...contain more nutrition than plant based fats.
B	...solid at room temperature.
C	...good for human health/digestive system.
D	...unsaturated fats.

Question 52

Higher the electronegativity, ... (ID-B03-12)

A	...lower the pull of electrons towards its nucleus.
B	...more stable the atom.
C	...lower the radioactivity of the atom.
D	...higher the radioactivity of the atom.
E	...higher the pull of electrons towards its nucleus.

Question 53

What type of cell junction in animal cells provide the similar function as plasmodesmata in plant cells? (ID-B03-86)

A	Anchoring junctions
B	Gap junctions
C	Tight junctions
D	Fiber junctions

Question 54

How many different types of White Blood Cells (WBCs) have been identified? (ID-B03-87)

A	3
B	6
C	5
D	4
E	2

Question 55

How many different amino acids are found in proteins? (ID-B03-36)

A	20
B	50
C	100
D	Millions
E	35

Question 56

What is a chemical buffer? (ID-B03-49)

A	A substance that resists changes in pH by accepting or donating hydrogen irons.
B	A substance that prevent genetic mutations.
C	A substance that increase the pH level of a high pH solution while decrease the pH level of a low pH solution.
D	A substance that prevent changes in pH by accepting or donating hydrogen irons.
E	A substance that resists genetic mutations.

Question 57

Which of the following statement is correct about DNA double helix? (ID-B03-40)

A	The base A pairs with base G while base C pairs with base T to form a double helix DNA.
B	The base A pairs with base T while base C pairs with base G to form a double helix DNA.
C	The base A pairs with base C while base G pairs with base T to form a double helix DNA.
D	The base A pairs with base T while base G pairs with base T to form a double helix RNA.
E	The base A pairs with base C while base G pairs with base T to form a double helix RNA.
F	The base A pairs with base G while base C pairs with base T to form a double helix RNA.

Question 58

What is the relative size of a typical eukaryotic cell? (ID-B03-58)

A	1/30th of a typical prokaryotic celll.
B	1/100th of a typical prokaryotic celll.
C	1/50th of a typical prokaryotic celll.
D	1/25th of a typical prokaryotic celll.
E	1/10th of a typical prokaryotic celll.

Question 59

What is chemotaxis? (ID-B03-64)

A	Movement of an organism in response to a chemical stimulus.
B	Process in which chemical difference between inside and outside the cell is maintained.
C	Production of proteins by the bone marrow to keep stable white blood cell count.
D	A digestive process used by herbivorous to break down the plant cells.

Question 59 Explanation: 

This is how Bacteria sense food.

Question 60

The phospholipids that form the plasma membrane allow non-polar molecules such as oxygen to move across the cell membrane. How is the ionic and polar molecules move across the membrane? (ID-B03-56)

A	The difference in pH levels inside and outside the cell facilitates movement of ionic and polar molecules.
B	Transport proteins form channels which allow ions and polar molecules to move across.
C	Simple diffusion process.
D	Receptor proteins codes the ionic and polar molecules so that it will be accepted by the phospholipids.

Question 61

What is the length range (size range) for most animal and plant cells? (ID-B03-53)

A	1.0 to 10 micrometres
B	0.1 to 1.0 micrometres
C	100 to 1000 micrometres
D	10 to 100 micrometres

Question 62

Which of the following statement is true about enzymes? (ID-B03-81)

A	They speed up chemical reactions without participating in the reaction.
B	They slow down chemical reaction by acting as a buffer.
C	They slow down chemical reaction by participating in the reaction.
D	They speed up chemical reactions by participating in the reaction.

Question 63

The H-bonding networks in proteins is at what level of structure? (ID-B03-34)

A	Primary structure:
B	Quaternary structure
C	Tertiary structure
D	Secondary structure

Question 64

Which of the following is a polysaccharide? (ID-B03-28)

A	Maltose
B	Glucose
C	Cellulose
D	Fructose

Question 65

A person who consumes a lot of fructose most likely experience... (ID-B03-27)

A	...high cholesterol.
B	...thyroid problems.
C	...obesity.
D	...diabetes.

Question 65 Explanation: 

Fructose that usually found in HFCS (corn syrup) increases the production of fats. Fructose does not give rise to an insulin response.

Question 66

What type of blood cells are formed in a process called erythropoiesis? (ID-B03-69)

A	Red blood cells
B	Serum
C	Platelets
D	White blood cells

Question 67

With the development of advanced microscopes, why would you still use a light microscope? (ID-B03-54)

A	There is a world wide shortage of advanced microscopes.
B	Light microscopes are cheaper for a biologist to obtain.
C	The techniques used to study microscopic particles in cell biology has not changed since 1665.
D	Movement of organic material is magnified in advanced microscopes hence harder to study.

Question 68

Which of the organic compounds illustrated below has a double bond? (ID-B03-21)

Image mod from: http://en.wikipedia.org/wiki/Ethyl_group

A	IV only
B	III only
C	II and IV
D	I, II and IV
E	II only
F	I only

Question 69

What is the atomic mass number of 14
6 C? (ID-B03-04)

A	8
B	6
C	14
D	7

Question 70

Alberta has considerable deposits of Uranium. What cancer causing gas is produced as a result of Uranium decay? (ID-B03-10)

A	Radon gas
B	Thorium gas
C	Natural gas
D	Sulfur mustard gas

Question 71

Why is the area/volume ratio has to be very small for biological cells to survive? (ID-B03-55)

A	To be able to communicate to the outside world.
B	To be able to process food and data.
C	To be able to stack together to form tissues.
D	To allow nutrients and gasses to pass across the cell surface.

Question 71 Explanation: 

Bit of tricky question because you may argue for few other answers listed above. However, there is a specific reason and that's what this question is asking for.

Question 72

Isotopes of same element have different amounts of what subatomic particle(s)? (ID-B03-73)

A	Protons and Neutrons
B	Protons
C	Electrons
D	Neutrons
E	Protons and Electrons

Question 72 Explanation: 

Example; the Carbon-12 have 6 neutrons while Carbon-14 has 8. But both have exactly same amount of protons and if they are not at a charged state, same amount of electrons as well.

Question 73

Only the ionic compounds will effectively dissolve in water. (ID-B03-18)

A	True
B	False

Question 73 Explanation: 

Water can dissolve ionic compounds and polar molecules.

Question 74

Cytoskeleton is composed of... (ID-B03-62)

A	...Ribosomes, Lysosome and Centriole.
B	...Plasma membrane, Ribosomes and Lysosome.
C	...Lysosome and Centriole.
D	...Microtubule, Intermediate filament and Microfilament.
E	...Centriole, Golgi apparatus and Ribosomes.

Question 75

Proteins are bonded by __I__ and these linking bounds are known as __II__. (ID-B03-33)

A	I. ionic bonds II. nucleic bonds
B	I. covalent bonds II. nucleic bonds
C	I. covalent bonds II. peptide bonds
D	I. ionic bonds II. peptide bonds

Question 76

Which of the following would you expect to observe on a person who is suffering from long term drug abuse? (ID-B03-66)

A	Increase in smooth endoplasmic reticulum.
B	Increase in rough endoplasmic reticulum.
C	Decrease production in glycoprotein.
D	Increase production in glycoprotein.

Question 77

A Carbon-14 atom (atomic number 6) that has lost an electron. What is the number of electrons remains? (ID-B03-72)

A	10 electrons.
B	13 electrons.
C	5 electrons.
D	8 electrons.
E	5 electrons.

Question 77 Explanation: 

Atomic number represents protons (+). A neutral atom will have equal number of protons (+) and electrons (-). If an electron is lost, then it must have one less electron than the atomic number.

Question 78

The classification organic compounds is based on the presence of what elements? (ID-B03-03)

A	Hydrogen, Carbon and Oxygen
B	Hydrogen and Oxygen
C	Carbon and Hydrogen
D	Carbon, Oxygen and Nitrogen
E	Nitrogen and Oxygen
F	Hydrogen, Oxygen and Nitrogen

Question 79

Which of the following statements are true about protein structure? (ID-B03-82)

A	Some proteins only have α helix structures while others can have only β pleated sheet structures.
B	Hydrogen bonds are primary structures of proteins.
C	Protein structures have four levels of structures.
D	The α helix and the β pleated sheet structures are tertiary structure.

Question 79 Explanation: 

Note: Only some proteins have four levels while most have three levels of structures.

Question 80

Plants store polysaccharides as what compound? (ID-B03-30)

A	Starch
B	Cellulose
C	Glycogen
D	Carboxylic acids

Question 81

Where are the hydrophilic and hydrophobic structures located on the following phospholipid diagram respectively? (ID-B03-48)

Image mod from: http://commons.wikimedia.org/wiki/File:0301_Phospholipid_Structure.jpg

A	I and III
B	I and IV
C	IV and I
D	III and IV
E	III and I

Question 82

What is the abundance of most stable isotope of carbon, the Carbon-12, in nature? (ID-B03-08)

A	75%
B	50%
C	65%
D	100%
E	99%

Question 83

Polymers are broken down to monomers by what process? (ID-B03-79)

A	Protein pumps
B	ATP injection
C	Hydrolysis
D	Heating

Question 84

Which of the following that both prokaryotic and eukaryotic cells have? (ID-B03-57)

A	DNA as genetic materials
B	Nucleus
C	Organelles
D	Cell walls

Question 84 Explanation: 

Note all prokaryotic cells have cell walls.

Question 85

The chitin is a ____ and it is used by insects and crustaceans to build their exoskeleton. (ID-B03-35)

A	disaccharide
B	monsaccharide
C	lipid
D	protein
E	polysaccharide

Question 86

During cell reproduction, chromatin fibers coil up into __I__ structures and when the cell is not dividing, chromatin fibers are in structures called __II__. (ID-B03-65)

A	I. chromosomes II. ribosomes
B	I. lysosomes II. nucleoli
C	I. ribosomes II. lysosomes
D	I. chromosomes II. chromatin
E	I. ribosomes II. nucleoli

Question 87

Lactose intolerant is caused due to lack of lactase enzyme, which hydrolyse what glycosidic bonds? (ID-B03-26)

A	β−1-->4
B	α−1-->4
C	α−1-->1
D	β−1-->1

Question 88

Choose the correct statement(s) from the following list. (ID-B03-13)

I. Covalent bonds are stronger than ionic bonds.
II. Chemical reactions always result in loss of electron(s).
III. Water is slightly polar.
IV. Ionic bonds are bound together with oppositely charged ions.

A	II and IV
B	All of the above statements are correct.
C	I and III
D	I and II
E	I , III and IV
F	I , II and III

Question 89

How many different RNAs are discovered by biologists? (ID-B03-41)

A	3
B	5
C	2
D	4

Question 89 Explanation: 

They are mRNA, tRNA and rRNA.

Question 90

Which of the following occur during a chemical reaction? (ID-B03-11)

A	Number of electrons within the structure increases. Hint: Not always, but sometimes.
B	Neutrons and protons from different atoms react with each other.
C	Valance shell electrons react with other atoms to form bonds.
D	Produce molecules and compounds with polarity. Hint: Not always, but sometimes.

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