Water enters the water vascular system of a sea star through a structure called the ____
a. ampulla
b. ossicle
c. radial canal
d. ring canal
e. madreporite
ANSWER: e
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A DNA molecule containing 32% thymine would contain how much cytosine?
A. 18% B. 32% C. 36% D. 64%
In order for familial retinoblastoma to appear in the phenotype
A. one new mutation must occur in a normal tumor suppressor gene B. two new mutations must occur in a pair of normal tumor suppressor genes C. one new mutation must occur in a proto-oncogene D. an oncogene must mutate to a tumor suppressor gene
For a gene with two alternative alleles, A (with a frequency of p) and B (with a frequency of q), the term in the algebraic form of the Hardy-Weinberg equilibrium for the heterozygote genotype frequency is
A. q2. B. p2. C. 2Aa. D. 2pq. E. (p+q)2.
While studying the infection process and life cycle of a newly discovered virus, it was determined that the virus never entered the nucleus of the host cell. This virus may have any of the following genomes except
A. single (-) strand RNA. B. DNA. C. double-stranded RNA. D. single (+) strand RNA.