Sea turtle social behavior is primarily:
a. small family groups.
b. formation of hunting groups.
c. solitary.
d. schooling.
e. harems.
C
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In the dark, the Na+ channels in the outer segments of rod cells are
A. open. B. closed. C. important in making the cell hyperpolarized in this resting state. D. primarily affected by inhibitory neurotransmitter input.
A scientist wants to study histones. Histones are:
A. proteins that double-stranded DNA molecules wrap around in eukaryotes. B. proteins that double-stranded DNA molecules wrap around in prokaryotes and eukaryotes. C. proteins that regulate checkpoints in the mitotic cell cycle. D. proteins that serve as the spindle fiber to pull sister chromatids apart during anaphase. E. proteins that required for the activity of Cdk enzymes.
Transplants of organs or tissues from two genetically unrelated organisms is known as a(n)
A) allograft. B) chimerigraft. C) transgenic animal. D) xenograft. E) none of the above
What structures in the cell of a fungus are not present in animal cells?
a. cell walls of cellulose and chloroplasts b. cell walls of cellulose c. cell walls of chitin and chloroplasts d. cell walls of chitin