Which of these is not a method used by ectotherms to affect body temperature?
A. dilation or contraction of blood vessels
B. shivering
C. countercurrent heat exchange
D. increasing metabolic rate
E. basking in the sun
Answer: D
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DNA repair in eukaryotes that facilitates replication in regions of thymine dimers is mediated by a unique DNA polymerase
A) ?. B) ?. C) ?. D) ?. E) ?.
In a partially diploid F? exconjugant, there are two alleles for lac (1 and 2 ) and two alleles for his (3 and 4). The phenotype of this cell is identical to a lac 1 his 4 cell. What is the best interpretation?
A) Lac 1 and 2 and his 3 and 4 share only lac 1 and his 4 phenotypes. B) Lac 1 complements lac 2 and his 3 complements his 4. C) Lac 1 and his 4 are dominant. D) Lac 1 and his 4 are wild types. E) Lac 1 shows its phenotype only if his 4 is also present.
Of the two lungs, the one on the left is usually smaller than the one on the right. This provides space for the ________
Fill in the blank(s) with correct word
A couple has three children, two of which have blonde hair. The third child and both parents have dark hair. What can be determined about the gene for hair color in this family?
a. Blonde hair color is an autosomal recessive trait. b. Blonde hair color is an autosomal dominant trait. c. Blonde hair color is a sex-linked dominant trait. d. Blonde hair color conveys a lethal mutation.