Which of the following best represents an adaptation to increase surface-to-volume ratio?
A) the long bones of a giraffe
B) the smooth skin of an earthworm
C) the multilobed sacs in the lungs
D) the striations of skeletal muscle
Answer: C
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When you are jogging, your muscles are using more oxygen and releasing more carbon dioxide into the blood than when you are at home on the couch. Which of the following would occur during your jog?
A) Blood pH would become more basic. B) The concentration of bicarbonate ions (HCO3-) in the blood would decrease. C) The medullary respiratory center would detect rising carbon dioxide levels. D) The volume of the dead air space would decrease.
The two-factor crosses performed by Mendel support the observation that
A. alleles for a given trait are distributed randomly among an individual's gametes independent of the alleles for other traits. B. traits that are encoded by genes on different chromosomes are never found within the same gamete. C. the F1 generation can display phenotypes in combinations different from those seen in the P generation. D. the F2 generation will only display phenotypes in the same combinations as the P generation. E. self-fertilization of the F1 generation will produce 100% heterozygous plants at both loci.
Classical" nuclear localization signals are composed primarily of
a. hydrophobic amino acids. b. acidic amino acids. c. basic amino acids. d. sulfur-containing amino acids.
Survival on land for organisms is difficult because of the problem of
A. desiccation. B. pollination. C. syngamy. D. coevolution. E. spore germination.