Which of the following is not important for classifying HIV as a retrovirus?
A. RNA genome
B. an envelope obtained from the host
C. integration into the host genome
D. reverse transcriptase
E. the production of viral DNA
Answer: B
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Which of the following methods of microbial control is mismatched?
A. Autoclaving nutrient agar before pouring into Petri plates - sterilization B. Exposure of surgical equipment to ultraviolet light - radiation C. Heating a liquid to 71.6°C for 15 seconds - pasteurization D. Pickling eggs - osmotic pressure
Genetic variation leads to genetic diversity in populations and is the raw material for evolution. Biological systems have multiple processes, such as reproduction, that affect genetic variation
They are evolutionarily conserved and shared by various organisms. Which statement best represents the connection between reproduction and evolution? A) Plants that use sexual reproduction are rare since this type of reproduction in plants does not contribute to genetic diversity. B) In order to increase genetic diversity for evolution in sexually reproducing organisms, mutations must occur in the zygote after fertilization. C) Since prokaryotic organisms reproduce asexually, there is no mechanism for them to add genetic diversity for evolution. D) Sexual reproduction increases genetic variation because random mutations can be shuffled between organisms.
Which of the following is a density-independent factor limiting human population growth?
A) social pressure for birth control B) earthquakes C) plagues D) famines E) pollution
Contaminated food is the source of ________, which causes meningitis in the elderly and susceptible persons
A) Neisseria meningitidis B) Streptococcus agalactiae C) Haemophilus influenzae D) Listeria monocytogenes E) Streptococcus pneumoniae