Human height shows a continuous variation from the very short to the very tall. Height is most likely controlled by
A. sex-linked genes.
B. epistatic genes.
C. mutations.
D. multiple genes.
Answer: D
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Meristematic tissue cells in plants are most similar to which kind of cells in animals?
A) somite cells B) ectodermal cells C) embryonic stem cells D) mesodermal cells
Which of the following statements is true?
a. If the numbers of a population decrease, an endangered species may be reclassified as a threatened species. b. If the numbers of a population decrease, a threatened species may be reclassified as an endangered species. c. If the numbers of a population increase, a threatened species may be reclassified as an endangered species. d. The terms threatened species and endangered species mean the same thing.
Gap junctions in cells
a. prevent fluid leakage between adjacent cells. b. are used only to stimulate cellular reproduction. c. allow ions to pass between adjacent cells. d. only occur in muscle tissue. e. do none of these.
Why has it been so hard to come up with an accurate measure of Earth's carrying capacity for humans?
What will be an ideal response?