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

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	Protect the nucleus from genetic mutations, even though this always does not work.
C	Provide energy for the DNA structure by converting energy from cells into ATP and transferring it to the nucleus.
D	Develop new genetic codes for evolutionary adaptations.

Question 2

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 3

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

Question 4

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

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

Question 5

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

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

Question 6

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

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

Question 6 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 7

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

A	6
B	7
C	8
D	14

Question 8

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

Question 9

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

A	Nucleic Acids
B	Carbohydrates
C	Proteins
D	Lipids

Question 10

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

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

Question 11

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

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

Question 12

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

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

Question 12 Explanation: 

pH = -log₁₀[H⁺]
[H⁺] = 10^-pH

Question 13

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

Question 14

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

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

Question 15

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

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

Question 15 Explanation: 

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

Question 16

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

Question 16 Explanation: 

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

Question 17

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 a polymer while glucose is a monomer.
C	Fructose is cheaper than glucose.
D	Fructose is sweeter than glucose.

Question 18

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

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

Question 18 Explanation: 

Note all prokaryotic cells have cell walls.

Question 19

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

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

Question 20

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

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

Question 20 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 21

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

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

Question 22

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

Question 23

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	Hydrogen bonds are primary structures of proteins.
D	The α helix and the β pleated sheet structures are tertiary structure.

Question 23 Explanation: 

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

Question 24

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

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

Question 25

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

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

Question 26

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

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

Question 26 Explanation: 

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

Question 27

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

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

Question 27 Explanation: 

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

Question 28

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

Question 29

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

A	Glucose
B	Peptidoglycan
C	Chitin
D	Flagella

Question 30

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

Question 31

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

Question 32

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

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

Question 33

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

A	4
B	5
C	3
D	2

Question 33 Explanation: 

They are mRNA, tRNA and rRNA.

Question 34

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

A	20
B	35
C	50
D	Millions
E	100

Question 35

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

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

Question 35 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 36

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 prevent genetic mutations.
E	A substance that resists genetic mutations.

Question 37

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

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

Question 38

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

A	4
B	6
C	3
D	2
E	5

Question 39

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

A	Benzene
B	Methane
C	Butane
D	Ethane

Question 40

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

Question 41

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

Question 42

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

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

Question 43

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

A	Cellulose
B	Glycogen
C	Starch
D	Carboxylic acids

Question 44

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

A	Protein pumps
B	ATP injection
C	Hydrolysis
D	Heating

Question 45

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

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

Question 46

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

A	False
B	True

Question 46 Explanation: 

Water can dissolve ionic compounds and polar molecules.

Question 47

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

Question 48

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

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

Question 49

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	They usually characterized by three double bonded C-O structures.
D	Most common two; glucose forms 5 membered structures while fructose forms 6 membered structure.

Question 50

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	Milk is the solvent while cocoa powder is the solute.
C	The milk acted as the solute which breaks down the chemical compounds in the cocoa powder.
D	The temperature of the mixture should have increased as the mixing progresses.

Question 51

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

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

Question 52

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

Question 53

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

A	Starch
B	Glycogen
C	Lipids
D	Chitin
E	Cellulose

Question 54

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 55

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

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

Question 56

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	The chemical properties such as high cohesion and polarity.
C	Very high electron transfer rate and high electrical conduction rate.
D	Very high reaction rate.

Question 57

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	Provide structural support for the nucleus.
D	Manufacture and distribution of molecules.
E	Energy processing.

Question 57 Explanation: 

In plants, this function is carried out by chloroplasts.

Question 58

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

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

Question 59

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

Question 60

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

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

Question 61

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

A	Glucose
B	Cellulose
C	Maltose
D	Fructose

Question 62

What is chemotaxis? (ID-B03-64)

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

Question 62 Explanation: 

This is how Bacteria sense food.

Question 63

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

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

Question 64

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

A	2
B	4
C	5
D	6
E	3

Question 65

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

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

Question 66

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	Cell theory
C	Endosymbiont theory
D	Theory of inheritance

Question 67

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

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

Question 68

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

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

Question 69

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

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

Question 70

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	Carbon and Hydrogen
D	Nitrogen and Oxygen
E	Hydrogen, Oxygen and Nitrogen
F	Carbon, Oxygen and Nitrogen

Question 71

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

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

Question 71 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 72

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

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

Question 72 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 73

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

Question 74

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

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

Question 75

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

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

Question 76

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

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

Question 77

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

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

Question 78

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	The difference in pH levels inside and outside the cell facilitates movement of ionic and polar molecules.
C	Receptor proteins codes the ionic and polar molecules so that it will be accepted by the phospholipids.
D	Simple diffusion process.

Question 79

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

A	All organic matter is compounds while molecules are inorganic.
B	Molecules composed of two or more different elements while compounds composed of two or more atoms.
C	Molecules easily react with organic matter therefore they often involved in chemical reactions. Compounds are stable entities and are often inert.
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 80

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 humans, they acts as the digestive compartments within cells.
C	In plants, they store toxins to protect them from predators.
D	They are the transport vesicles that deliver glycoprotein from ER membrane to Golgi apparatus.

Question 81

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

A	polysaccharide
B	protein
C	lipid
D	disaccharide
E	monsaccharide

Question 82

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

Question 83

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

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

Question 84

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	Produce molecules and compounds with polarity. Hint: Not always, but sometimes.
D	Valance shell electrons react with other atoms to form bonds.

Question 85

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

Question 86

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

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

Question 87

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

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

Question 88

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

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

Question 89

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

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

Question 90

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

A	False
B	True

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