The photosensitive sensory organ for a flatworm is a(n):
A. compound eye.
B. single-lens eye.
C. eyecup.
D. ommatidia.
C
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The reverse transcription of HIV RNA utilizes host cell tRNA as a primer. Specifically, a tRNA for lysine is utilized. Would a drug that blocked the host cell synthesis of the tRNA for lysine be a good drug to prevent the HIV life cycle?
A. Yes, it should stop the reverse transcription of the HIV genome with few side effects. B. No, the virus would just use a different tRNA for priming. C. No, this would likely kill the cells that were drug treated, because they couldn't appropriately incorporate lysine into their proteins D. No, the priming function of the tRNA is not essential for the HIV life cycle.
Examples of mollusks that live on land are the
A. earthworms. B. land crabs. C. mussels. D. scorpions. E. snails and slugs.
When the human gene coding for insulin is introduced into a mouse embryo, the gene is correctly
expressed in the appropriate tissue. This shows that:a. tissue-specific gene expression is highly conserved during evolution. b. the introduced gene was edited by the mouse embryo for proper function. c. the introduced gene was exactly the same as the mouse gene for insulin. d. mice and humans are not closely related. e. mouse genes are not tissue specific.
Which of the following immune system components has been identified in almost all multicellular
organisms? a. bone marrow b. phagocytes c. antimicrobial peptides d. T-cells e. memory cells