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

Question 2

What is chemotaxis? (ID-B03-64)

A	Process in which chemical difference between inside and outside the cell is maintained.
B	Movement of an organism in response to a chemical stimulus.
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 2 Explanation: 

This is how Bacteria sense food.

Question 3

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

Question 4

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

A	Methane
B	Ethane
C	Benzene
D	Butane

Question 5

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 6

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

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

Question 7

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	15, iron
D	25 , nitrogen
E	22 , iron
F	15 , nitrogen

Question 8

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

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

Question 8 Explanation: 

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

Question 9

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

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

Question 10

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

Question 11

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

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

Question 12

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

A	True
B	False

Question 12 Explanation: 

Water can dissolve ionic compounds and polar molecules.

Question 13

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	Endosymbiont theory
C	Theory of inheritance
D	Genetic theory

Question 14

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

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

Question 15

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	Majority of organic cells lacks nucleus.
E	Only the animal cells that have materials that move around (mobile).

Question 16

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

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

Question 16 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 17

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 0.1% 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 1.0% of the human body weight.
E	The elemental abundance must be less than 0.2% of the human body weight.

Question 18

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

A	Proteins
B	Nucleic Acids
C	Carbohydrates
D	Lipids

Question 19

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

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

Question 20

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

A	Lipids
B	Chitin
C	Glycogen
D	Starch
E	Cellulose

Question 21

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

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

Question 21 Explanation: 

Note all prokaryotic cells have cell walls.

Question 22

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 23

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 23 Explanation: 

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

Question 24

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	Anchoring junctions
E	Membrane junctions

Question 25

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

A	8
B	14
C	6
D	7

Question 26

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

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

Question 27

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

A	lipid
B	monsaccharide
C	polysaccharide
D	protein
E	disaccharide

Question 28

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

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

Question 29

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

Question 30

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

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

Question 31

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

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

Question 32

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

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

Question 32 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 33

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

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

Question 34

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

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

Question 35

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

Question 36

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

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

Question 37

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

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

Question 38

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 hydrogen bonds.
C	The very high electronegative nature of the molecule.
D	The high atomic mass.

Question 39

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	In humans, they acts as the digestive compartments within cells.
C	In plants, they store toxins to protect them from predators.
D	They process materials and produce usable energy for eukaryotic cells.

Question 40

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

A	2
B	5
C	4
D	3

Question 40 Explanation: 

They are mRNA, tRNA and rRNA.

Question 41

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

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

Question 42

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

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

Question 43

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

A	6
B	4
C	5
D	2
E	3

Question 44

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 tRNA structure is linear.
D	Only the mRNA structure is linear.

Question 45

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

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

Question 46

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

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

Question 47

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

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

Question 48

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

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

Question 48 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 49

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

Question 50

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

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

Question 50 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 51

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 52

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

Question 53

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

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

Question 54

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

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

Question 55

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

A	ATP injection
B	Heating
C	Hydrolysis
D	Protein pumps

Question 56

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 57

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	Helium-4
D	Nitrogen-12
E	Carbon-14

Question 57 Explanation: 

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

Question 58

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	Hydrogen bonding
C	Vital hormone producing reactions
D	Acid-base reactions

Question 59

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

Question 60

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

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

Question 61

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

Question 62

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 62 Explanation: 

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

Question 63

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

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

Question 63 Explanation: 

In plants, this function is carried out by chloroplasts.

Question 64

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

A	Starch
B	Glycogen
C	Cellulose
D	Carboxylic acids

Question 65

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 66

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

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

Question 67

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

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

Question 68

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	5 electrons.
C	10 electrons.
D	8 electrons.
E	5 electrons.

Question 68 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 69

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

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

Question 70

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 speed up chemical reactions by participating in the reaction.
C	They slow down chemical reaction by acting as a buffer.
D	They slow down chemical reaction by participating in the reaction.

Question 71

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

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

Question 72

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

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

Question 72 Explanation: 

pH = -log₁₀[H⁺]
[H⁺] = 10^-pH

Question 73

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

A	Maltose
B	Glucose
C	Fructose
D	Cellulose

Question 74

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

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

Question 75

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

A	Flagella
B	Glucose
C	Peptidoglycan
D	Chitin

Question 76

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

A	False
B	True

Question 77

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

Question 78

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

A	35
B	50
C	100
D	Millions
E	20

Question 79

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

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

Question 80

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

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

Question 81

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

Question 82

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

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

Question 82 Explanation: 

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

Question 83

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

Question 84

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

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

Question 85

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

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

Question 86

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 87

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 only found in plant cells because animal cells with movement cannot maintain the structure.
C	They are composed of globular proteins that are assembled and disassembled in different regions of the cell to form hollow pathways.
D	They are composed of action and involved in cell movement and maintaining cell structure.

Question 88

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

A	5
B	6
C	3
D	2
E	4

Question 89

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	Natural gas
D	Radon gas

Question 90

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 mixing of the two most likely have broken down the molecular bounds of water and that resulted in reaction with cocoa powder.
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.

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