A human cell has
A) 22 pairs of sex chromosomes and one pair of autosomes.
B) 22 pairs of autosomes and one pair of sex chromosomes.
C) 23 pairs of autosomes.
D) 23 pairs of autosomes and a pair of Y chromosomes.
B) 22 pairs of autosomes and one pair of sex chromosomes.
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It is late at night and you are walking along a
dark sidewalk. In the bushes next to the sidewalk you hear something moving. Your heart starts beating fast, your pupils dilate, and you become very anxious. The neurotransmitter creating this effect is
a. acetylcholine. b. norepinephrine. c. dopamine. d. serotonin. e. an endorphin
The close relationship between ____ and animals can be seen in the similarity of these protists and sponges, simple
animals.
a. cellular slime molds b. choanoflagellates c. diatoms d. brown and red algae e. flagellates protozoans
Which of the following methods is used by plants when they are undergoing asexual reproduction?
A. Development of rhizomes. B. Production of stolons. C. Growth of suckers from the root base of specific types of trees. D. All of the answer choices are methods of asexual reproduction in plants.
The panting responses that are observed in overheated birds and mammals dissipate excess heat by _____
A) countercurrent exchange B) acclimation C) vasoconstriction D) evaporation