Tissues on either sides of an apical meristem
develop into
a. flowers.
b. branches.
c. lateral meristems.
d. leaves.
e. more than one of these
D
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It appears that eukaryotic diversity took off around 800 million years ago. Which of the following is thought to be responsible for this?
A. By 800 million years ago, enough time had passed since the arrival of eukaryotes for evolutionary adaptation to take place. B. Eukaryotic organisms first arrived 800 million years ago, so when they did, they quickly diversified. C. Chloroplasts first arrived 800 million years ago. D. Environmental conditions changed 800 million years ago, namely an increase in oxygen and a decrease in sulfide. E. All of the answer options are correct.
If a viral gene prevents peptidoglycan units from being linked to lipid carriers, what will happen to the bacterial cell?
A. The cell wall will weaken, eventually leading to cell lysis. B. The bacterial cell will start to take on the properties of a Gram-negative cell. C. The cell wall with become stronger leading to virus to enter the lysogenic cycle. D. Lipid metabolism will become impaired.
A compound similar to auxin, 2,4,5-trichlorophenoxyacetic acid (2,4,5-T), has been used
A. as a fertilizer for corn and wheat. B. an herbicide for killing woody seedlings and dicot weeds. C. to detoxify the dangerous poison dioxin. D. as a spray to promote flowering of pineapple. E. as an organic substitute for chlorine bleach.
Why is the synthesis of mRNA a central issue for all viruses? How do different types of viruses achieve this goal?
What will be an ideal response?