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

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

Question 2

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

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

Question 3

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

Question 4

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

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

Question 5

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

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

Question 6

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

A	False
B	True

Question 7

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

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

Question 8

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

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

Question 9

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

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

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

Question 10

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 11

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

A	4
B	2
C	3
D	6
E	5

Question 12

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

Question 13

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

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

Question 13 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 14

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

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

Question 15

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

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

Question 16

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

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

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

Question 18

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

Question 19

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 20

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

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

Question 21

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

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

Question 22

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

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

Question 23

What is chemotaxis? (ID-B03-64)

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

Question 23 Explanation: 

This is how Bacteria sense food.

Question 24

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

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

Question 25

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

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

Question 26

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

A	2
B	5
C	4
D	6
E	3

Question 27

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

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

Question 28

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	...lower the pull of electrons towards its nucleus.
E	...more stable the atom.

Question 29

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-13
C	Nitrogen-12
D	Carbon-14
E	Carbon-12

Question 29 Explanation: 

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

Question 30

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

A	Only the mRNA structure is linear.
B	Only the tRNA 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 31

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 32

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

A	6
B	14
C	7
D	8

Question 33

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

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

Question 34

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

Question 35

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

Question 36

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

A	Flagella
B	Peptidoglycan
C	Chitin
D	Glucose

Question 37

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

Question 38

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

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

Question 38 Explanation: 

Note all prokaryotic cells have cell walls.

Question 39

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

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

Question 40

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

Question 41

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

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

Question 41 Explanation: 

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

Question 42

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 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 globular proteins that are assembled and disassembled in different regions of the cell to form hollow pathways.

Question 43

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

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

Question 44

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

A	Millions
B	100
C	35
D	50
E	20

Question 45

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	Heat is produced through instantaneous reactions such as boiling water. Temperature is the quantitative measurement of heat.
C	Temperature is the amount of energy associated with movement of atoms while heat 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 46

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. replication II. translation
F	I. transcription II. translation

Question 47

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

A	Glucose
B	Fructose
C	Cellulose
D	Maltose

Question 48

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	Lipids
D	Carbohydrates

Question 49

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

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

Question 50

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

Question 51

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

A	Cellulose
B	Starch
C	Chitin
D	Glycogen
E	Lipids

Question 52

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

Question 53

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

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

Question 53 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 54

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

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

Question 55

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	10 times less H+
D	100 times more H+
E	10 times more H+

Question 55 Explanation: 

pH = -log₁₀[H⁺]
[H⁺] = 10^-pH

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

Question 57

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

A	Heating
B	Protein pumps
C	ATP injection
D	Hydrolysis

Question 58

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

Question 60

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

A	Butane
B	Benzene
C	Ethane
D	Methane

Question 61

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

A	disaccharide
B	monsaccharide
C	lipid
D	polysaccharide
E	protein

Question 62

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

A	True
B	False

Question 62 Explanation: 

Water can dissolve ionic compounds and polar molecules.

Question 63

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

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

Question 63 Explanation: 

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

Question 64

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

A	Develop new genetic codes for evolutionary adaptations.
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	Protect the nucleus from genetic mutations, even though this always does not work.

Question 65

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

Question 66

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 66 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 67

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

A	Carboxylic acids
B	Glycogen
C	Starch
D	Cellulose

Question 68

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 68 Explanation: 

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

Question 69

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 temperature of the mixture should have increased as the mixing progresses.
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	Milk is the solvent while cocoa powder is the solute.

Question 70

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

Question 71

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

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

Question 72

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

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

Question 73

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

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

Question 74

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

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

Question 75

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

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

Question 76

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 77

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 78

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

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

Question 78 Explanation: 

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

Question 79

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

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

Question 80

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 81

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

A	4
B	2
C	5
D	3

Question 81 Explanation: 

They are mRNA, tRNA and rRNA.

Question 82

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	Aquaporins protein
D	Glycophorin protein
E	Band 3 protein

Question 83

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

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

Question 83 Explanation: 

In plants, this function is carried out by chloroplasts.

Question 84

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 84 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 85

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 0.2% 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 0.1% of the human body weight.
E	The elemental abundance must be less than 0.4% of the human body weight.

Question 86

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

Question 87

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

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

Question 88

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 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 prevent genetic mutations.

Question 89

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

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

Question 89 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 90

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 high atomic mass.
D	The hydrogen bonds.

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