During capacitation, sperm become mature. Indicate whether the statement is true or false


True

Biology & Microbiology

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Which of the following is the correct order of the levels of DNA packaging in eukaryotic chromosomes?

A) nucleosome ? chromatin fiber ? looped domains ? heterochromatin B) nucleosome ? looped domains ? chromatin fiber ? heterochromatin C) heterochromatin ? nucleosome ? chromatin fiber ? looped domains D) chromatin fiber ? heterochromatin ? nucleosome ? looped domains E) chromatin fiber ? nucleosome ? looped domains ? heterochromatin

Biology & Microbiology

What is the organelle shown in this diagram?



a. mitochondrion
b. ribosome
c. chloroplast
d. Golgi apparatus

Biology & Microbiology

isotope

What will be an ideal response?

Biology & Microbiology

Austad (1993) compared senescence in mainland and island opossums. Island opossums lived in an essen-tially enemy-free environment

He found that island opossums tended to live longer and that this increased longevity was paralleled by a de-crease in age-specific decline (breakage of collagen fibers). Age-specific fertility also followed the same pat-tern. Why do these results fit the predictions of the mutation accumulation or antagonistic pleiotropy hy-pothesis? a. Older individuals on the mainland contribute less to reproduction than on the island. b. Older individuals on the mainland contribute more to reproduction than on the island. c. Without predators, individuals experience less stress, which corresponds to a lower rate of living. d. Without predation, individuals get older and can acquire more late-acting mutations.

Biology & Microbiology