Sponges, cnidarians, and flatworms all lack which characteristic found in most other animal groups?
A) the blastula embryo
B) a coelom
C) motility
D) symmetry
E) tissues
Answer: B
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Suppose you are provided with an actively dividing culture of E. coli bacteria to which radioactive thymine has been added. What would happen if a cell replicates once in the presence of this radioactive base?
A) One of the daughter cells, but not the other, would have radioactive DNA. B) Neither of the two daughter cells would be radioactive. C) All four bases of the DNA would be radioactive. D) Radioactive thymine would pair with nonradioactive guanine. E) DNA in both daughter cells would be radioactive.
Normal fruit flies have red eyes. Flies with mutations that block the function of the X-linked white gene have white eyes. The wild-type allele is completely dominant to mutant alleles. A white-eyed female fruit fly is mated to a red-eyed male. One of their hundreds of female progeny is white-eyed. What is the likely karyotype of this white-eyed daughter?
A) XX B) XXY C) XO D) XXX E) XYY
A typical long bone has an epiphysis at each end, which can be thought of as
A) yellow bone marrow. B) a cylindrical hollow shaft. C) a tough layer of connective tissue. D) a site of water storage. E) an enlarged knob.
An organism serving the role of host is a part of the interaction called
A. competition. B. mutualism. C. parasitism. D. predation.