All cells of the human body contain 23
a. pairs of chromosomes.
b. chromosomes.
c. pairs of genes.
d. genes.
e. alleles.
Question 2
Doris works a stressful job, has difficulty falling asleep, and she often wakes up early. After several weeks, she agrees to participate in a sleep study to determine whether she has insomnia.
It is likely that the results of her sleep study show Doris:
a. spends less time sleeping as people who do not complain of insomnia.
b. is lacking in the substances that promote and maintain sleep.
c. spends as much time sleeping as people who do not complain of insomnia.
d. has an excess of arousal-producing neurochemicals.
Generalized body plan of a bony fish
Deformation in human bones caused by (a) rickets and (b) osteoporosis.
Electronmicrograph showing a blood clot composed of fibrin, red blood cells, and tissue debris.
Dorsiflexion Dorsiflexion–Bending a body part backward.
Human body in anatomical ¬position
Dermatomes of body, posterior view