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

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

A	monsaccharide
B	disaccharide
C	polysaccharide
D	protein
E	lipid

Question 2

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

Question 3

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

A	2
B	4
C	6
D	5
E	3

Question 4

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

Question 5

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

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

Question 5 Explanation: 

In plants, this function is carried out by chloroplasts.

Question 6

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	1/25th of a typical prokaryotic celll.
D	1/10th of a typical prokaryotic celll.
E	1/50th of a typical prokaryotic celll.

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 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	III only
F	IV only

Question 9

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

Question 10

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

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

Question 11

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 12

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

A	Peptidoglycan
B	Glucose
C	Flagella
D	Chitin

Question 13

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

Question 14

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

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

Question 15

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

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

Question 15 Explanation: 

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

Question 16

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

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

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

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

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

Question 18

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

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

Question 19

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

A	Millions
B	50
C	35
D	100
E	20

Question 20

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

A	Starch
B	Cellulose
C	Glycogen
D	Lipids
E	Chitin

Question 21

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

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

Question 22

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

A	Carboxylic acids
B	Starch
C	Glycogen
D	Cellulose

Question 23

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

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

Question 24

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

A	Compared to unsaturated fatty acids, they have a very high melting point.
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	They have kinks caused by double bonding of carbon atoms.

Question 25

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 26

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

Question 27

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	Low radioactivity and polarity.
C	The hydrogen bonds.
D	The high atomic mass.

Question 28

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

Question 29

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

A	True
B	False

Question 29 Explanation: 

Water can dissolve ionic compounds and polar molecules.

Question 30

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

A	2
B	4
C	3
D	5
E	6

Question 31

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 31 Explanation: 

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

Question 32

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

A	Hydrolysis
B	Protein pumps
C	Heating
D	ATP injection

Question 33

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

A	3-carbin sugar, phosphate group and a nitrogenous base
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 adenine

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

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

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

Question 36

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 0.2% 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 0.1% of the human body weight.

Question 37

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

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

Question 38

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 39

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

Question 40

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

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

Question 41

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

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

Question 42

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 43

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	5 electrons.
C	5 electrons.
D	8 electrons.
E	13 electrons.

Question 43 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 44

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

Question 45

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

Question 45 Explanation: 

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

Question 46

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

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

Question 46 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 47

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	Endosymbiont theory
C	Cell theory
D	Theory of inheritance

Question 48

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

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

Question 48 Explanation: 

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

Question 49

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

A	Glucose
B	Fructose
C	Maltose
D	Cellulose

Question 50

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

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

Question 51

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

Question 52

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

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

Question 53

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

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

Question 54

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 55

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

Question 56

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 57

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

Question 57 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 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

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 more H+
E	10 times less H+

Question 59 Explanation: 

pH = -log₁₀[H⁺]
[H⁺] = 10^-pH

Question 60

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 61

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

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

Question 62

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 63

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

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

Question 64

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

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

Question 64 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 65

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

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

Question 66

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

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

Question 67

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

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

Question 67 Explanation: 

Note all prokaryotic cells have cell walls.

Question 68

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 69

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 70

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	Cell theory
C	Genetic theory
D	Theory of evolution
E	Laws of inheritance

Question 71

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

A	2
B	4
C	3
D	5

Question 71 Explanation: 

They are mRNA, tRNA and rRNA.

Question 72

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

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

Question 72 Explanation: 

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

Question 73

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

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

Question 74

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

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

Question 75

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 75 Explanation: 

This is how Bacteria sense food.

Question 76

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

A	Nucleic Acids
B	Proteins
C	Lipids
D	Carbohydrates

Question 77

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

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

Question 78

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

A	Methane
B	Butane
C	Ethane
D	Benzene

Question 79

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	Heat is produced through instantaneous reactions such as boiling water. Temperature is the quantitative measurement of heat.
D	Temperature is a long term quantitative measurement of energy while heat is a short term measurement of energy.

Question 80

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 81

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 82

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 83

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

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

Question 84

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

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

Question 85

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

A	False
B	True

Question 86

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 87

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 acts as a low pH buffer.
D	Because CO2 is an acid.

Question 88

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

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

Question 89

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

Question 90

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

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

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