In most prokaryotes, DNA replication proceeds
a. without an RNA primer.
b. 3? to 5?.
c. using only a single strand as a template.
d. bidirectionally.
Answer: D
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You purchase two identical houseplants and place them side by side on your windowsill. You keep the soil moist in one of the plants (plant a), and you water the other plant (plant b) only once every two weeks
Do you expect the plants to be the same height after six months of this watering regime? A. Yes, because both plants are still getting water. B. Yes, because both plants are still getting water and sunlight. C. No, because the cells of the apical meristem are unable to express meristem identity genes without sufficient water in plant b. D. No, because the cells of the apical meristem are unable to elongate without sufficient water in plant b.
When a nerve impulse travels from neuron 1 to neuron 2, neuron 1 is known as the _____
a. postsynaptic neuron b. presynaptic neuron c. synapse d. gated channel e. dendrite
T cells become mature, programmed cells in the _______________. Fill in the blank(s) with the appropriate word(s)
How do deletions and translocations in chromosomes often occur?
A) during meiosis I, sister chromatid exchange leads to abnormalities B) chromosomes will break and the sticky ends will rejoin C) chromosomes will fuse telomere to telomere D) when cells undergo meiosis II, chromosomes naturally break when sister chromatids are being pulled apart E) colchicine treatment causes chromosomal rearrangements