Plant hormones bind specific cellular receptor molecules that trigger gene expression responses. Which statement is correct concerning these responses?
A. Only cells lacking receptors can bind hormones.
B. Only cells in the meristem can respond.
C. Only cells that express the appropriate receptors can bind hormones.
D. Only cells that have been previously activated can bind hormones.
E. None of these choices is correct.
C. Only cells that express the appropriate receptors can bind hormones.
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Another name for programmed cell death is
A) necrosis. B) perforation. C) apoptosis. D) cellular degradation.
Below is a pedigree of a human genetic disease in which solid color indicates affected individuals. Assume that the disease is caused by a gene that can have the alleles A or a. If individuals 2 and 3 have a child together, what is the probability that the child will exhibit the disease?
A) 0%
B) 25%
C) 50%
D) 75%
E) 100%
In women, blocked oviducts can result from sexually transmitted diseases
a. True b. False
Which of the following is not a feature of a seed?
A. Environmental signals such as light or temperature can trigger germination. B. It contains a protective coat formed from the outer layers of ovule cells. C. It is a complex structure that allows the embryo to be dispersed to distant sites. D. The embryo is surrounded by nutritive tissue or has cotyledons that contain nutritive tissue. E. It contains a large percentage of water to support the embryo.