The atrioventricular valves are closed when the heart is in complete diastole
Indicate whether the statement is true or false
FALSE
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Four of the five answers below are factors that contribute to strong fossil records of certain species. Select the exception
a. persisted for a long time b. hard body parts c. concentrated in one geological area d. lived in dense populations e. widespread distribution
Regulation of protein concentration can occur by ________________.
a. alteration of the transcription of the gene coding for that protein b. removal of the RNA coding for that protein c. allosteric modulation of that protein's activity d. A and B are correct e. A, B, and C are correct
All of the following are chemical mutations EXCEPT
A. hydroxylamine. B. ethyl methanesulfonate. C. nitrogen mustard. D. X-rays. E. nitrous acid.
The Crenarchaeota group of archaeons contains which of the following types of organism?
A. hyperthermophiles B. hypothermophiles C. halophiles D. methanogenic organisms E. basophiles