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

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

A	Flagella
B	Peptidoglycan
C	Chitin
D	Glucose

Question 2

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

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

Question 3

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

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

Question 4

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

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

Question 4 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 5

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

Question 6

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 the amount of energy associated with movement of atoms while heat is the intensity of heat (average speed of atoms).
C	Heat is the amount of energy associated with movement of atoms while temperature is the intensity of heat (average speed of atoms).
D	Temperature is a long term quantitative measurement of energy while heat is a short term measurement of energy.

Question 7

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 are the largest biological molecules.
D	They do not form polymers.

Question 8

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

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

Question 8 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 9

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

A	Benzene
B	Ethane
C	Methane
D	Butane

Question 10

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

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

Question 11

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

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

Question 11 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 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	Transmission Electron Microscope (TEM)
C	Electron Microscope (EM)
D	Light Microscope (LM)

Question 13

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

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

Question 14

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	Protein structures have four levels of structures.
C	The α helix and the β pleated sheet structures are tertiary structure.
D	Hydrogen bonds are primary structures of proteins.

Question 14 Explanation: 

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

Question 15

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

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

Question 15 Explanation: 

In plants, this function is carried out by chloroplasts.

Question 16

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

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

Question 17

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

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

Question 18

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

Question 19

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

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

Question 20

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

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

Question 21

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

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

Question 22

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

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

Question 23

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

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

Question 23 Explanation: 

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

Question 24

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

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

Question 25

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

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

Question 26

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

Question 27

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

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

Question 27 Explanation: 

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

Question 28

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

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

Question 29

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

Question 30

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

A	14
B	7
C	8
D	6

Question 31

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

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

Question 31 Explanation: 

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

Question 32

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

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

Question 33

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

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

Question 34

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

Question 34 Explanation: 

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

Question 35

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

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

Question 36

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 production in glycoprotein.
C	Increase in rough endoplasmic reticulum.
D	Decrease production in glycoprotein.

Question 37

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 38

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

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

Question 39

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

A	False
B	True

Question 40

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

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

Question 41

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

A	Lipids
B	Carbohydrates
C	Proteins
D	Nucleic Acids

Question 42

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

A	3
B	2
C	4
D	5
E	6

Question 43

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

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

Question 44

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

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

Question 45

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

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

Question 46

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

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

Question 47

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

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

Question 48

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

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

Question 49

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

Question 50

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

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

Question 51

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

Question 52

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

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

Question 53

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

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

Question 54

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

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

Question 54 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 55

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

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

Question 56

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

Question 57

What is chemotaxis? (ID-B03-64)

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

Question 57 Explanation: 

This is how Bacteria sense food.

Question 58

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

A	False
B	True

Question 58 Explanation: 

Water can dissolve ionic compounds and polar molecules.

Question 59

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

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

Question 60

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

A	4
B	5
C	3
D	2

Question 60 Explanation: 

They are mRNA, tRNA and rRNA.

Question 61

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

A	Glycogen
B	Cellulose
C	Chitin
D	Starch
E	Lipids

Question 62

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

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

Question 63

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

A	100
B	Millions
C	20
D	35
E	50

Question 64

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

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

Question 65

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

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

Question 66

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

Question 67

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

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

Question 67 Explanation: 

Note all prokaryotic cells have cell walls.

Question 68

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	Glycophorin protein
E	Aquaporins protein

Question 69

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

A	Cellulose
B	Glucose
C	Fructose
D	Maltose

Question 70

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

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

Question 71

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

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

Question 72

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

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

Question 73

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

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

Question 74

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

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

Question 75

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	I only
F	II only

Question 76

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

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

Question 77

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

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

Question 77 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 78

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

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

Question 79

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

Question 80

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

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

Question 81

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

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

Question 82

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

Question 83

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

A	polysaccharide
B	protein
C	monsaccharide
D	lipid
E	disaccharide

Question 84

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

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

Question 85

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

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

Question 86

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

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

Question 87

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

A	Carboxylic acids
B	Cellulose
C	Glycogen
D	Starch

Question 88

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

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

Question 89

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

A	ATP injection
B	Hydrolysis
C	Protein pumps
D	Heating

Question 90

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

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

Question 90 Explanation: 

pH = -log₁₀[H⁺]
[H⁺] = 10^-pH

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