When the gene p53 initiates apoptosis, the cell's DNA causes the cell to
A. enter prophase.
B. spontaneously break down the cell membrane.
C. become differentiated.
D. digest itself from the inside out.
D. digest itself from the inside out.
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Some regions of chromosomes remain highly condensed, tightly coiled, and untranscribed throughout the cell cycle. These regions are referred to as
A. transposable elements. B. single sequence repeats. C. non-coding DNA. D. short interspersed elements. E. constitutive heterchromatin.
Amphibians appeared on land about:a
543 million years ago. b. 450 million years ago. c. 420 million years ago. d. 250 million years ago. e. 65 million years ago.
Instinctive behaviors that are performed in exactly the same way every time they are triggered are
defined as ____.
a. sign stimuli b. fixed action patterns c. releasers d. habitual behaviors e. conditioned behaviors
The use of ________ to treat drinking water, which began in 1913, reduces the incidence of waterborne diseases
A) coagulation B) chlorination C) filtration D) UV irradiation