Respond to the following statements in reference to the five plant hormones listed below.
A. This hormone mediates tropisms.
B. This hormone causes a stem to lengthen between the nodes by inducing cell division and elongation.
C. This hormone opposes the effects of auxin.
D. This hormone promotes bud and seed dormancy.
E. This hormone is a gas that promotes ripening.
A. auxins
B. gibberellins
C. cytokinins
D. abscisic acid
E. ethylene
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All of the following may influence the rate of simple diffusion across a selectively permeable membrane EXCEPT the
A) concentration gradient. B) size of the molecule. C) lipid solubility of the molecule. D) size of the cell. E) temperature.
Endospores
A) are bacterial reproductive structures. B) may be produced when nutrients are scarce. C) are produced by bacteria, algae, and fungi. D) are resistant to everything except radiation. E) can last for only about 10 years.
In an experiment, Jokela et al. reared 14 replicate populations of a snail that is poly-morphic for sexual/asexual reproduction under controlled identical conditions in the lab
Each population started with 35% asexual and 65% sexual experiments. The figure be-low shows the proportions of asexual after a year-long experimental run. What are possible explanations for this result? a. All asexuals survived better under the experimental conditions. b. Asexual females produced more offspring per individual than sexual fe-males. c. The cost of males leads to faster population growth for the asexual sub-population. d. A novel mutation after the start of the experiment led to the increased sur-vival of the asexual line with the mutations. e. A, B, and C.
A mismatched base pair causes a distortion in the DNA backbone. If this were the only indication of an error in replication, the overall rate of mutation would be much higher. Explain why
What will be an ideal response?