Work by Charles Darwin and Francis Darwin was instrumental in the discovery of which type of plant
hormone?
a. auxins
b. brassinosteroids
c. jasmonates
d. cytokinins
e. gibberellins
A
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Based on the fossil record of the Rhynie cherts, what structures were present in the earliest vascular plants? Select all correct choices
A. stomata B. cuticles C. extensive root systems D. multi-veined leaves E. sporangia
In frequency-dependent selection, highest mortality can be expected in
a. the most abundant genotype. b. the least abundant genotype. c. the least well-adapted genotype. d. heterozygous genotypes. e. homozygous recessive genotypes.
The pleural cavity is located:a
between the pleural membranes. b. inside the innermost pleural membrane. c. outside the outermost pleural membrane. d. between the right lung and the left lung. e. within the bronchioles.
A recent study suggests the surprising idea that intestinal goblet cells present food antigens to dendritic cells to induce tolerance to food molecules. Thus, goblet cell dysfunction may be a cause of food allergies. If this is true, it illustrates the importance of coordination between which two organ systems?
A. circulatory system and endocrine system B. digestive system and endocrine system C. digestive system and immune system D. immune system and circulatory system