Mutant forms of tumor-suppressor genes act _____; both copies of the gene must be _______ before their protective function is lost.
a) as dominant Mendelian traits, mutated or deleted
b) recessively, mutated or deleted
c) recessively, preserved
d) as dominant Mendelian traits, preserved
Ans: b) recessively, mutated or deleted
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A frameshift mutation results in
a. a normal protein due to the redundancy of the genetic code. b. errors in DNA replication c. errors in DNA splicing d. a change in all mRNA codons downstream from the mutation e. a change in the third position of one codon
The range of all factors that influence whether
a species can obtain resources essential for survival and reproduction is its a. habitat. b. niche. c. carrying capacity. d. ecosystem. e. community.
A fastidious organism might be grown on which of the following types of media?
A) transport media B) reducing media C) enriched media D) differential media E) selective media
Any substance that can cause an immune response is a/an:
A) microbe. B) nonspecific defense. C) antigen. D) interferon. E) antibody.