How is the timing of gene expression controlled in the lytic cycle?
What will be an ideal response?
Ans: Regulatory genes function in a cascade to control gene expression. The first genes are expressed using the host's transcription apparatus. One of the newly transcribed genes encodes a protein required for transcription of the next set of genes. The next transition requires a gene product produced by these genes.
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Which method of animal cell infection is used by enveloped viruses, but not non-enveloped viruses?
a. receptor-mediated endocytosis b. membrane-channel injection c. fusion d. diffusion
Approximately how many neurons are in the human brain?
a. 1,000 b. 10,000 c. 100,000 d. 100,000,000 e. 100,000,000,000
How would an air temperature rise of 10°C typically affect evaporation from leaves?
a. It would mostly eliminate evaporation. b. It would double the rate of evaporation. c. It would triple the rate of evaporation. d. It would quadruple the rate of evaporation.
Lipoproteins are important for
a. transport of fats in the blood and lymphatic system. b. synthesis of triglycerides. c. synthesis of adipose tissue. d. enzyme production.