Hereditary information (with the exception of some viruses) is preserved in:
A) deoxyribonucleic acid.
B) membrane structures.
C) nuclei.
D) polysaccharides.
E) ribonucleic acid.
Ans: A) deoxyribonucleic acid.
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Most microorganisms maintain their internal pH
A. near neutral (pH 7). B. slightly alkaline (pH 8-10). C. near their optimum growth pH. D. slightly acidic (pH 4-6).
Optimal conditions for most mycobacterial cultures are:
a. 25°C to 30°C in the dark in an atmosphere of 2% carbon dioxide (CO2) and high hu-midity. b. 35°C in the dark in an atmosphere of 5% to 10% CO2 and high humidity. c. 35°C in the dark in a microaerophilic at-mosphere of 10% CO2 and high humidity. d. 32°C in the dark in an atmosphere of de-creased CO2 and increased humidity.
A male that mates for the optimal time will not fertilize all of the eggs carried by a female.
a. true b. false
Identical twins occur when ________
A) two eggs are released and are fertilized by two different sperm B) one egg is released and is fertilized by one sperm, and the fetus later splits into two C) one egg is released and is fertilized by one sperm, and the pre-embryo later splits into two D) two eggs are released and are fertilized by the same sperm