Which of the following is not a part of the general viral reproductive cycle?
A. Viral recognition of host surface proteins.
B. Genome entry into the cell and immediate expression of some viral genes.
C. Viral proteins are synthesized.
D. Reverse transcriptase converts RNA to DNA.
E. Fully assembled viruses are released.
D. Reverse transcriptase converts RNA to DNA.
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A person's diet is
A. a weight-loss program. B. the amount of weight lost as a result of consuming less food. C. the amount of food and drink consumed each day. D. the amount of food consumed each day measured in calories.
Which of the following could be an agent of natural selection?
A. accidental death of cows by lightning strikes B. insects that are eaten after they have reproduced C. characteristics of female animals that cause males to avoid them D. increases in the population size
Which receptor below induces cell invasion?
a. AGFR b. HGF c. Src d. beta-catenin
Purine bases, such as adenine and guanine, have ________ joined ring(s) for their structure, compared to pyrimidine bases, such as cytosine and thymine, that have ________ ring(s) in their structure.
A. one; two B. two; three C. two; one D. three; one