A proto-oncogene ____
a. always becomes cancerous
b. causes cancer
c. encodes tumor-suppressing proteins
d. repairs DNA
e. regulates cell division
e
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Which of the following statements about DNA profiles is false?
1.Individuals vary in the length of certain DNA sequences called short tandem repeats located at many different chromosomal sites. 2.Each locus can have dozens of alleles of short tandem repeats (STRs). 3.In the U.S., DNA profiles utilize a standardized set of 13 STRs. 4.STRs are amplified by PCR before Southern blotting and visualization. 5.Due to environmental influences, STRs differ slightly between identical twins. 6.Even very old samples of DNA can yield sequences that are appropriate for DNA profiling.
A metabolic pathway that is both anabolic and catabolic is a(n)
A) amphibolic pathway B) constructive pathway C) antagonistic pathway D) glycolytic pathway
Auxotroph:
A. An organism with a wild-type complement of genes enabling it to grow with a simple requirement for nutrients B. A mutant unable to synthesize a required small molecule, and therefore must obtain it from the environment C. Certain wild-type bacteria that have complicated growth requirements, and may be difficult to grow in culture D. The early form of bacteria that gives some of its DNA to another cell
All of the following are characteristics of an effective vaccine except
A. it should have a relatively long shelf life. B. it should be easy to administer. C. it should stimulate only the antibody (B-cell) response. D. it should not require numerous boosters. E. it should protect against wild forms of the pathogen.