Antiestrogens can bind to estrogen receptor sites
a. without activation.
b. without inhibition.
c. and amplify the response.
d. and prevent reception of hormone action.
e. and increase growth of tumors.
A
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When a characteristic is shared by species that do not share a common ancestor this is caused by which of the following?
a. the evolution of homologous characteristics b. the evolution of vestigial characteristics c. the change in allele frequency in the gene pool of the species d. the convergence of form of organisms that share similar environments
In animal skeletal muscles, red muscle fibers
a. have an abundance of myoglobin. b. are mainly anaerobic. c. have few mitochondria. d. are good for short bursts of activity. e. more than one of these answers is true.
The cross L p q / l P Q × l p q / l p q is carried out. If the L gene is in the middle, between genes P and Q, what would be the genotypes of the double crossover gametes in this cross?
A) L P Q and l p q B) L p Q and l P q C) l p Q and L P q D) L p q and l P Q E) cannot be determined
Variations of homologous genes that result in differences in structure and function are
A) alleles. B) loci. C) autosomes. D) dominant. E) linked.