Which of the following is a component of the spore—or zygote—wall (in mosses, ferns, gymnosperms, and angiosperms) and helps prevent the desiccation of these structures?
A. sporangium
B. sporopollenin
C. chitin
D. peptidoglycan
E. sporangia
B
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A gradual change in an organism, from an ancestral type, was referred to by Darwin as
A. an adaptation. B. descent with modification. C. convergent evolution. D. artificial selection. E. natural selection.
Which of the following is NOT a part of the male human reproductive system?
A. seminiferous tubules B. vas deferens C. cervix D. penis
Which process uses energy in the proton pump system?
a. proton pump b. cation channel c. anion cotransporter channel
A human skin cell contains 46 chromosomes (23 paternally inherited and 23 maternally inherited). Before mitosis begins, this cell must duplicate its genetic material. What are the products of this duplication?
A) 92 chromosomes, each consisting of 2 homologous chromatids connected by a centromere B) 23 chromosomes, each consisting of a maternal and a paternal chromatid connected by a centromere C) 92 chromatids, each consisting of 2 sister chromosomes connected by a kinetochore D) 92 sister chromatids, in 46 pairs that are connected by a centromere E) 46 chromosomes, each consisting of 2 sister chromatids connected by a kinetochore