Which of the following mechanisms dissipates heat?
a. Countercurrent exchange between vessels that service the extremities
b. Trapping air by raising fur or feathers
c. Vasodilation of surface vessels
d. Vasoconstriction of surface vessels
e. Countercurrent exchange between vessels that service the extremities and vasoconstriction of surface vessels
Answer: c. Vasodilation of surface vessels
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When lactose is present in the medium, RNA polymerase will bind to the ____ of the E. coli lac operon
a. lacI gene b. operator c. promoter d. transcription initiation site e. first codon of the lacZ gene
In garden peas, one pair of alleles controls the height of the plant, and a second pair of alleles controls
flower color. The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p). A tall plant with purple flowers crossed with a dwarf plant with white flowers produces 1/2 tall with purple flowers and 1/2 tall with white flowers. What is the genotype of the parents? What will be an ideal response?
The disease osteoporosis involves loss of both mineral and organic components from bones. Factors that may contribute to the development of osteoporosis include
A. lack of calcium and vitamin D in the diet. B. excess fat in the diet. C. prolonged disuse of muscles. D. a history of extreme sport participation. E. a decline in estrogen following menopause in women.
As a protein is being synthesized, the correct folding of the protein is aided by the movement of nonpolar amino acids toward the inner areas of the protein. How can this phenomenon be explained?
What will be an ideal response?