Many times species are composed of networks of distinct populations called metapopulations. When do metapopulations occur?
A. When a population in a better habitat does not send out colonizers into less suitable habitats.
B. When suitable habitat is patchily distributed and separated by areas of unsuitable habitat.
C. When a population is large and uniformly distributed.
D. When a population in poor habitat continually sends out dispersers to bolster populations in better habitats.
Answer: B
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All of the following are true regarding anoxygenic photosynthesis except
A) a water molecule is split. B) sulfide or thiosulfate can act as electron donors. C) absorbed light energy is typically in the near ultraviolet and far red ranges of the light spectrum. D) NADPH is regenerated by photoreduction. E) it is a light-driven oxidation-reduction process.
There are ____________________ chromosomes in a human tetraploid cell.Fill in the blank(s) with the appropriate word(s)
The portion of the molecule in box 5 of Figure 12-1 is:
a. a hydrogen bond.
b. a phosphate.
c. a nucleotide.
d. a pyrimidine.
e. a protein.
During which process would a cell plate form?
A) cytokinesis in an animal cell B) cytokinesis in a plant cell C) mitosis in an animal cell D) mitosis in a plant cell