Which reproductive isolation mechanism explains why a large dog, such as a Newfoundland, would not normally mate
with a small dog, such as a Chihuahua?
a. sexual isolation
b. gametic isolation
c. temporal isolation
d. behavioral isolation
e. mechanical isolation
e
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If primary production increases in an ecosystem, it would be reasonable to expect that
A. nutrients would no longer be limiting factors. B. net production would not increase. C. cellular respiration would decrease. D. the trophic web would become more complex. E. the biomass of herbivores would increase.
DNA replication is said to be semiconservative because
a. the number of nucleotides within genes remains constant. b. half of the DNA in a cell comes from one parent and the other half from the other parent. c. the same process of DNA replication is used by all organisms. d. the total amount of DNA within an individual remains the same. e. each new DNA molecule is composed of one old strand and one new strand.
Muscle contraction does not shorten the muscle filaments (myosin and actin). How then, does a contraction produce tension?
What will be an ideal response?
Which body region is composed of cartilage?
a. nose b. outer ear c. windpipe d. embryonic skeleton e. all of these