Mendel's second law of independent assortment has its basis in which of the following events of meiosis I?
A) synapsis of homologous chromosomes
B) crossing over
C) alignment of tetrads at the equator
D) separation of cells at telophase
C
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Hormone A binds to intracellular receptors in its target tissue. As a result of Hormone A, the target
tissue is now sensitive or responsive to Hormone B. The action of Hormone A was to
a. decrease mRNA for Hormone A receptors. b. increase receptor sites for Hormone B. c. increase receptor sits for Hormone A. d. increased cyclic AMP levels which activated receptors for hormone B. e. decrease receptor sites for Hormone B.
Why are fossils from older species found deeper in the earth than those from more recent species?
A) Layers of sediments accumulate every year, covering older fossils in more layers. B) Older species were more likely to burrow underground. C) Modern species can swim better than older species. D) Older species were more likely to be trapped in sediments and form fossils than modern species.
Pituitary dwarfism is caused by:
a. hypersecretion of thyroxine during childhood. b. hyposecretion of thyroxine during childhood. c. hypersecretion of growth hormone during childhood. d. hyposecretion of growth hormone during childhood. e. hypersecretion of epinephrine during childhood.
Xylem and phloem are found in __________.
a. the vascular plants, which include lycophytes, ferns, gymnosperms, and angiosperms b. all plants c. bryophytes, ferns, conifers, and angiosperms d. only the gametophytes of vascular plants e. only the vascular plants with seeds