Which of the following is an ongoing trend in the evolution of land plants?
A) decrease in the size of the leaf
B) reduction of the gametophyte phase of the life cycle
C) elimination of sperm cells or sperm nuclei
D) increasing reliance on water to bring sperm and egg together
E) replacement of roots by rhizoids
Answer: B) reduction of the gametophyte phase of the life cycle
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The gene (IGF1) that encodes a growth hormone has one allele (IGF1-A) that is found in small dogs but not in dogs that are very large. What does this suggest about body size of small dogs?
A. Body size depends on how much growth hormone is produced during early fetal development. B. Body size depends on whether or not the IGF1-A allele is present, if it is the dog grows very large, if it is not present the dog retains a small size. C. It suggests that small dogs are small because the IGF1-A allele is expressed, perhaps inhibiting the growth of the dog and the release of growth hormone. D. It suggests that small dogs have more growth hormone released during fetal development but none released after the birthing process. E. Body size depends on nutrition, not on genetics.
Recognition of self versus non-self is accomplished by ____
a. macrophage function b. complement system activation c. B and T cell cloning d. the presence of MHC markers on cell membranes e. memory cell formation
The cells in the gastric glands that produce digestive substances are the:a
goblet and pyloric cells. b. alpha and beta cells. c. pyloric and parietal cells. d. chief and goblet cells. e. parietal and chief cells.
Jasmonic acid is structurally similar to prostaglandins
Indicate whether the statement is true or false