A virus that infects a bacteria is known as a(n):
a. Eukaryophage
b. Virophage
c. Bacteriovirus
d. Prokayrophage
e. Bacteriophage
Ans: e. Bacteriophage
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A single-celled diploid eukaryote with 8 chromosomes undergoes mitosis. How many chromosomes do the resultant offspring possess?
a. 2 b. 4 c. 8 d. 16
Penicillin is a drug that acts by:
a. irreversibly inhibiting transpeptidase. b. reversibly inhibiting transpeptidase. c. competitively inhibiting transpeptidase. d. noncompetitively inhibiting transpeptidase. e. denaturing transpeptidase
You are working in the field with your favorite bacteria species, Bacterium BB. You carry out some experiments with Bacterium BB, and find that it can now degrade toluene and it is pathogenic! What happened?
A. Bacterium BB was transformed with a resistance plasmid and a digestive plasmid. B. Bacterium BB acquired degradative and virulence plasmids by horizontal gene transfer. C. Bacterium BB was exposed to a bacteriophage which is now in its lytic phase. D. Bacterium BB sexually reproduced with another strain of bacteria that had both toluene-degrading gene and virulence gene. E. Bacterium BB picked up fertility and Col-plasmids via conjugation.
Due to a mutation in the HEXA gene, a substance called GM2, normally present in the tissues and nerve cells of the brain, accumulates there. This mutation mainly effects enzymes associated with which organelle in an affected individuals' cells?
a. nucleus b. endoplasmic reticulum c. plasma membrane d. lysosomes