In humans, the sex of a child is determined by
A. the sex chromosome in the egg.
B. the number of autosomes in the sperm.
C. the number of autosomes in the egg.
D. the sex chromosome in the sperm.
E. the number of X chromosomes in the egg.
D. the sex chromosome in the sperm.
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Living organisms are different from inanimate objects because they
a. react to environmental stimuli. b. exhibit massive complexity. c. possess molecules of deoxyribonucleic acid. d. exhibit multiple levels of organization. e. all of these
Hydrophilic molecules
A) do not readily dissolve in water. B) are repelled by water. C) are neutral and nonpolar. D) form hydrogen bonds among themselves. E) readily dissolve in water.
The human disease Nijmegen breakage syndrome results from mutations in genes related to
a. nucleotide excision repair. b. double-strand break repair pathways. c. photoreactivation. d. base excision repair. e. mismatch repair.
Which of the following provides the best evidence that modern humans are evolving?
A. In humans of northern European descent, blue-eyed individuals are at greater risk of vitamin D deficiency than brown-eyed individuals. B. Adult humans of American descent eat fruits and vegetables grown all over the world. C. Adult humans of northern European descent can readily digest lactose. D. Modern humans have opposable thumbs.