Small structures used for removing debris from the surface of sea stars are:

a. madreporites.
b. spines.
c. tubercles.
d. pedicellariae.
e. the dermal gills.


D

Biology & Microbiology

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PCR produces

A. DNA fragments of all possible sizes. B. DNA fragments that are one nucleotide larger than the next fragment. C. DNA fragments of a particular size. D. DNA fragments of increasing size. E. DNA fragments that are one nucleotide larger than the next fragment AND DNA fragments of increasing size.

Biology & Microbiology

The maximum number of individuals of a species that a given environment can sustain indefinitely defines ____

a. the carrying capacity of the environment b. exponential growth c. the doubling time of a population d. density-independent factors e. density independent factors

Biology & Microbiology

What situation results from a postfertilization barrier to reproduction?

A) mutations in genes that control development B) offspring that fail to develop C) mechanical isolation of a species D) gamete incompatibility

Biology & Microbiology

Which of the following is not a structural motif associated with transcriptional regulation?

A) CpG motif B) helix-turn-helix C) zinc finger D) leucine zipper E) helix-loop-helix

Biology & Microbiology