Which of the following are commonly used to study phylogeny?
A. Whole genomes because they are easy to obtain.
B. Segments of membrane proteins because the proteins are encoded by DNA.
C. Specific mRNA chloroplast sequences because they are found in the genomes of all living organisms.
D. Small ribosomal subunit (SSU) RNA because it is found in the genomes of all living organisms.
E. None of these answers are correct.
D. Small ribosomal subunit (SSU) RNA because it is found in the genomes of all living organisms.
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Suppose that a mistake made during DNA replication in a cell is not corrected, but instead the
mutation remains in the single strand where it occurred. Then suppose that after the cell divides both daughter cells survive, and those cells then go on to have DNA replication and ultimately cell division. There are now four cells where there once was one cell. Assuming that the mistake was never corrected and that no new uncorrected mistakes occurred, how many of the four cells will have the mutation in their DNA?
a. none b. one c. two d. three e. four
When the population growth of the prey = 0, is the predator population increasing or decreasing?
a. It is always decreasing. b. It is always increasing. c. At the left point it is increasing and at the right point it is decreasing. d. At the right point it is decreasing and at the left point it is increasing.
Which of the following characteristics is NOT
present in all animal phyla? a. multicellularity b. organ systems c. heterotrophy d. diploidy e. sexual reproduction
Torsion of the adult body is characteristic of
a. mollusks in general. b. gastropods. c. bivalves. d. squids. e. none of these.