Which Lophotrochozoan phylum includes earthworms, bristle worms, and leeches?
a. Platyhelminthes
b. Nemertea
c. Rotifera
d. Annelida
Answer: d. Annelida
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Determining the functional nature of a microbial community by analysis of bulk DNA samples extracted from environmental samples may be misleading for all of the following reasons EXCEPT
A. the DNA obtained can depend on the extraction method used. B. some of the DNA may be from non-functional entities such as spores. C. DNA is of little use in identifying unknown microbes. D. some of the DNA recovered may be from non-living organisms.
The movement of water molecules during osmosis is due to
A. diffusion. B. active transport. C. pinocytosis. D. endocytosis.
The gene p53 is called the ________ because it corrects mutations in the spindle apparatus before nondisjunction can occur
A) M phase checkpoint monitor B) tumor-suppressor monitor C) S phase checkpoint monitor D) guardian of the genome
Which of the following statements about the structure or composition of DNA is FALSE?
A. Each nucleotide within a DNA strand is separated by about 0.34 nm B. Adenine pairs with thymine and guanine with cytosine C. DNA is a double helix D. The amount of thymine closely approximates that of guanine within a particular organism E. Complementary base-pairing occurs between pyrimidine and purine bases