Which of the following would be found in a reptile but NOT in an amphibian?
a) mammary glands
b) "jelly"-covered egg
c) aquatic larva using gills to breathe
d) internal fertilization
Ans: d) internal fertilization
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Refer to the figure above. A branched metabolic pathway synthesizes two related amino acids (D and F). If there is a genetic defect, resulting in a nonfunctional enzyme (3), how could you ensure that adequate amounts of the amino acid F are synthesized?
A) Supplement intermediate B. B) Supplement intermediate C. C) Add enzyme 2 to the medium. D) Supplement with intermediate E.
In female humans and other mammals, dosage compensation is achieved by the inactivation of one of the two X chromosomes in each cell. Which one of the following does not occur in the X-inactivation mechanism of female mammals?
A. X-inactivation begins with a small region of the X chromosome that contains a gene for an X-inactivation specific transcript (Xist). B. Xist is expressed in low levels except when an X chromosome is about to be inactivated. C. When an X chromosome is about to be inactivated, Xist RNA transcripts increase markedly and undergo splicing, but do not encode a protein. D. Xist RNA is attracted to and associates with a protein called the X-chromosome inactivation center (XIC), which becomes entirely coated with Xist. E. Xist RNA recruits factors that promote DNA methylation, histone modification, and other changes associated with transcriptional silencing.
Scrubbing or immersing the skin in chemicals to reduce the numbers of microbes on the skin is ________.
A. sanitization B. disinfection C. degermation D. sterilization
The rash of spotted fever rickettsiosis is the result of
A) capillary damage. B) infection of skin cells. C) allergic reaction to the vector. D) production of a toxin that causes inflammation. E) infection of sebaceous glands.