Archaeopteris, the first known tree, has all of the following characteristics EXCEPT:
A. occurred in forests
B. contained wood
C. had a eustele
D. had a vascular cambium
E. reproduced by seeds
E. reproduced by seeds
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Fitness is a measure of reproductive success. If an individual with genotype BB produces 6 offspring, and a heterozygous individual (Bb) produces 10 offspring, and a third individual with genotype bb produces 5 offspring, what is the fitness value for the individual with BB genotype?
A. 1.0. B. 0.5. C. 0.6. D. 0.4. E. 1.1
Recently, consumption of trans fatty acids has been linked to high blood cholesterol levels and increased risk of heart disease. The food industry has responded by decreasing use of "trans fats."
Consider the following questions: (a) How do the structures and transition temperatures of trans, cis, and saturated fatty acids differ, and what are the effects on membrane fluidity? (b) Are trans fatty acids abundant in nature? (c) The major source of trans fats is hydrogenated oils. (The trans fats are produced by a side reaction during the hydrogenation process.) Why has the food industry used synthetically produced hydrogenated oils? What will be an ideal response?
In animals, all of the following are associated with embryonic development except
A. Migration of cells to specific areas B. formation of germ layers C. Activation of all the genes in each cell D. Inductive tissue interactions E. cell division at a relatively rapid rate
In humans, B cells mature in the _____, and T cells mature in the _____.
A) GALT, liver B) lymph nodes, spleen C) bursa, thymus D) bone marrow, thymus