An unprotected area of naturally occurring plant and animal assemblages that is surrounded by unsuitable territory due
to development or habitat destruction is referred to by biologists as:
a. an island.
b. ex situ conservation.
c. a reserve.
d. a park.
e. a refuge.
a
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In a single polymerase chain reaction (PCR) cycle consisting of 15 seconds at 94 °C, 30 seconds at 50 °C, and 1 minute at 72 °C, what is happening in the step run at 50 °C?
A) The DNA to be amplified is being denatured. B) Primers are being denatured. C) DNA polymerase is extending new DNA from the primers. D) Primers are annealing to the DNA to be amplified. E) DNA polymerase is being inactivated.
How does recombination frequency relate to activities in the cell?
a. Recombination frequency relates to activities in the cell by the frequency at which mutation disrupt the proper functioning of a gene. b. Recombination frequency relates to activities in the cell by the frequency at which post-transcriptional editing results in new functions for the product of a gene. c. Recombination frequency relates to activities in the cell by the frequency at which crossing over in meiosis separate two genes that were located on the same chromosome. d. Recombination frequency relates to activities in the cell by the frequency at which non-disjunction errors are generated by chromosomes refusing to separate during anaphase I.
Parapatric speciation occurs most often ____
a. within in the same home range b. populations inhabiting different areas while maintaining contact along a common border c. within a group of interbreeding populations d. on either side of geographic barriers e. by polyploidy
The ________ portion of the cell membrane is responsible for the isolating function of the membrane, whereas the ________ portion regulates exchange and communication with the environment
A) nucleic acid; lipid B) protein; cholesterol C) lipid; protein D) carbohydrate; lipid E) cholesterol; lipid