The part of a chromosome that shortens with each cell division, functioning as a "clock," is the

A) centromere.
B) centrosome.
C) centriole.
D) telomere.


D) telomere.

Biology & Microbiology

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In pre-mRNA processing, ____

a. exons are spliced out and used to produce ribosomal subunits b. introns are spliced out and combined to form complete proteins c. introns are spliced out and combined in the tRNA d. exons are spliced out and the introns are combined in the mature mRNA e. introns are spliced out and the exons are combined in the mature mRNA

Biology & Microbiology

Most chytrids are ____

a. saprobes in soil b. parasites of plants c. symbiotic partners of cattle d. parasites of animals e. aquatic

Biology & Microbiology

The dikaryotic stage of a fungal life cycle is described as ____

a. n b. n + n c. 2n + 2n d. 2n e. 2n + n

Biology & Microbiology

Which of the following features is not part of the ecological niche of a white-tailed deer?

A. the availability of woods for it to use as cover in order to escape from predators B. the number of acorns it consumes during the fall C. the presence of a water source within its habitat D. All of these are part of a white-tailed deer's ecological niche.

Biology & Microbiology