All of the following are characteristics of viruses except
A) Define shape
B) Ability to infect host cells
C) Ultramicroscopic size
D) Metabolism
E) Genes
D) Metabolism
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Cancer can be characterized by:
A. a mass of rapidly dividing cells called a tumor. B. metastasized tumor cells that leave the tumor and invade distant parts of the body. C. cells that express of a type of intermediate filament that is inappropriate for that area of the body. D. cells with an enhanced ability to adhere to proteins in the basal lamina. E. All of these choices are correct.
Following unprotected sex with a guy you met at a party, you are now worried about what you might have been exposed to during this episode. Ten days later, you talk to your doctor about getting an HIV test. What is the doctor's response?
A. HIV infection can be latent and asymptomatic for years, so testing should be postponed until you exhibit symptoms of AIDS. B. It's too soon to detect the antibody produced by your immune system in response to HIV exposure, so a test will come back negative. Wait a few more weeks to be tested. C. The incidence of HIV infection in the United States is at an all-time low level, so transmission was not at all likely, especially after only a single possible exposure. D. The antibiotic that you have been taking for a urinary tract infection will also destroy HIV, so you don't have to worry about an infection.
In DNA replication,
A: DNA polymerases add deoxyribonucleotides only to the 3? end of a growing strand. B: the 3? end of the primer contains a free 3?-hydroxyl group. C: the strand grows from the 3? end to the 5? end. D: Both a and b E: Both b and c
Bacterial RNA polymerase binds to the ________
A) operator B) proto-oncogene C) regulatory gene D) promoter