Question

Multiply choice questions:

Mark the right alternative by drawing a small but obvious ring around the letter corresponding to your choice for each of the question. 1 point of each for correct answer. No negative points if not correct answer.

Question 7 Hydrophobic interactions occur when:

a) Nonpolar molecules cluster in aqueous solutions. b) Polar molecules cluster in aqueous solutions. c) Polar molecules interact with nonpolar molecules in a polar environment. d) Nonpolar molecules dissociate in aqueous solutions.

Question 8 Biosynthesis of new peptidoglycan chains can be inhibited by?

a) Lysozyme b) Penicillin c) Both

Question 9 The chemical properties of an amino acid are determined primarily by the amino acid’s

a) Carboxylic group. b) Amino group c) R group d) Alpha carbon

Question 10 The monomeric units in polysaccharides are linked together by ..... bonds

a) peptide b) glycoside c) lipoidal. d) hydrogen

Question 11 In the presence of oxygen, microbial cells convert glucose to CO2 and H2O with the production of energy through:

a) respiration b) fermentation c) cycle of Krebs d) oxidative phosphorylation

Question 12 The cytoplasmic membrane’s functions include:

a) Permeability barrier b) Protein anchor c) Energy conservation d) All of the above

2

Question 13 Enzyme activity can be influenced by:

a) temperature b) pH c) substrate concentration d) all of the above

Question 14 Chemolitotrophs obtain energy from:

a) Organic chemicals b) Inorganic chemicals c) Both organic and inorganic chemicals d) Light

Question 15 Protein coding sequences of DNA are known as

a) RNA segments b) chromosomes c) genes d) histones

Question 16 The greatest source of biomass on Earth comes from

a) Prokaryotic cells b) Plants c) Animals d) Plants and animals together

Question 17 The regulation of the concentration of a certain amino acid in the cell can be carried out through:

a) Inhibition of the enzyme responsible for the first step of the production pathway by

feedback inhibition b) Inhibition of expression of the genes that lead to the production of the enzymes needed

for the pathway c) Both

Question 18 Central dogma of Biology refers to this process:

a) DNA to RNA to Protein b) Protein to RNA to DNA c) Does direction even matter! d) None of the above

Answer 1