Biology: Practice Questions

Topics: DNA replication, DNA, Bacteria Pages: 9 (1930 words) Published: April 6, 2011
BIOL1102 2008

Practice Questions from week 2 lectures

1. The presence of cholesterol in the plasma membrane of some animals: a) Enables the membrane to stay fluid more easily when cell temperature drops b) Enables the animal to remove hydrogen atoms from saturated phospholipids c) Enables the animal to add hydrogen atoms to unsaturated phospholipids d) Makes the membrane less flexible, allowing it to sustain greater pressure from within the cell e) Makes the animal more susceptible to circulatory disorders

2. What kinds of molecules pass through a cell membrane most easily? a) Large and hydrophobic
b) Small and hydrophobic
c) Large polar
d) Ionic
e) Monosaccharides

3. A patient has had a serious accident and lost a lot of blood. In an attempt to replenish body fluids, distilled water equal to the volume of blood lost is transferred directly into one of his veins. What will be the most probable result of this transfusion? a) It will have no unfavourable effects as long as the water is free of viruses and bacteria b) The patient’s red blood cells will shrivel up because the blood fluid is hypertonic compared to the cells c) The patient’s red blood cells will swell because the blood fluid is hypotonic compared to the cells d) The patient’s red blood cells will shrivel up because the blood fluid is hypotonic compared to the cells e) The patient’s urine output will decrease

4. All of the following membrane activities require energy from ATP hydrolysis except: a) Facilitated diffusion
b) Active transport
c) Na+ ions moving out of the cell
d) Proton pumps
e) Translocation of potassium into a cell

5. All of the following processes take material into cells except: a) Pinocytosis
b) Endocytosis
c) Exocytosis
d) Active transport
e) Carrier-facilitated diffusion

6. According to the fluid mosaic model of membrane structure, proteins of the membrane are mostly: a) Spread in a continuous layer over the inner and outer surfaces of the membrane b) Confined to the hydrophobic core of the membrane

c) Embedded in the lipid bilayer
d) Randomly orientated in the membrane, with no fixed inside-outside polarity e) Free to depart from the fluid membrane and dissolve in the surrounding solution

7. Look at the processes listed below; which one of these defines all the others? a) Osmosis
b) Diffusion of a solute across a membrane
c) Facilitated diffusion
d) Passive transport
e) Transport of an ion down its electrochemical gradient

8. Which of these statements regarding enzymes if false?
a) Enzymes are proteins that function as catalysts
b) Enzymes display specificity for certain molecules with which they interact c) Enzymes provide activation energy for the reactions they catalyse d) The activity of enzymes can be regulated by other molecules e) An enzyme may be used many times over for a specific reaction

Practice Questions from week 3 lectures

1. Which of the following statements is false? Viruses…
a) Only replicate intracellularly
b) Exist extracellularly in the environment
c) Always cause damage to the host
d) Can affect the evolution of all organisms
e) Can sometimes become part of the host genome

2. The process of horizontal gene transfer from one bacterial cell to another that is mediated by self-transmissible plasmids is called: a) Transduction
b) Transformation
c) Conjugation
d) All of the above
e) None of the above

40. Which of the following is true about viruses?
a) Some of the most deadly viruses of humans arise by...
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