The floral meristem in flowering plants develops from the shoot apical meristem, which usually produces leaves. Which floral part is NOT a modified leaf?
A) sepal
B) carpel
C) stamen
D) pollen tube
Answer: D
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When a steroid hormone and a peptide hormone exert similar effects on a population of target cells, then _____
A) the steroid and peptide hormones must use the same biochemical mechanisms B) the steroid and peptide hormones must bind to the same receptor protein C) the steroid hormones affect the synthesis of effector proteins, whereas peptide hormones activate effector proteins already present in the cell D) the steroid hormones affect the activity of certain proteins within the cell, whereas peptide hormones directly affect the processing of mRNA E) the steroid hormones affect only the release of proteins from the target cell, whereas peptide hormones affect only the synthesis of proteins that remain in the target cell
Why has Atlantic cod evolved to mature at a younger age and smaller size?
a. DNA damage from radiation released accidentally from nuclear power plants b. unknown causes c. food competition from other predatory fish d. intraspecies competition e. overexploitation by fishing
The yolk sac is indicated by
a. A. b. B. c. C. d. D. e. E.
Which of the following is defined as "all of the various species living in the same area?"
Community Ecosystem Population Organism