You are working on a drug to affect heart function, and you are told to direct the drug to change the relaxation of the ventricles. If your drug is successful, it will alter
A. the oxygen content in the blood.
B. the force of contraction of the atria.
C. venous pressure.
D. diastolic pressure.
E. systolic pressure.
D. diastolic pressure.
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Most cancers require at least two mutations: 1) one in an oncogene, which encodes proteins that trigger cell division,
and 2) one in a tumor suppressor gene, whose protein products, in their unmutated form, play a key role in preventing the cell cycle from progressing if the DNA is damaged or in the absence of specific cues. Which class of proteins might be considered tumor suppressors?
a. Cdk inhibitors b. cyclins c. growth factor receptors d. microtubules e. transcription factors
A mass extinction, perhaps caused by a large asteroid hitting Earth near the Yucatan peninsula in the Cretaceous period, produced_____________, which created uninhabitable conditions.
A. active tectonic plate movements that rapidly repositioned continental plates B. All of the answer choices are correct. C. massive volumes of soot, and triggered major climate changes D. forest and range fires over hundreds of years E. a large numbers of volcanic eruptions for millions of years
Which gas is increasing in the atmosphere and
intensifying the greenhouse effect? a. carbon dioxide b. carbon monoxide c. ozone d. nitrogen e. oxygen
A terrestrial vertebrate that has scales and a three-chambered heart is a(n)
A) reptile. B) amphibian. C) mammal. D) bird. E) lobe-finned fish.