Which of the following are used to distinguish species from one another?
A. differences in the physical characteristics of organisms
B. differences in behavior
C. differences in metabolism
D. All of the choices are correct.
D. All of the choices are correct.
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What is the minimum number of aminoacyl-tRNA synthetase enzymes needed to attach amino acids to all the various tRNA molecules?
A. 61 B. 20 C. 64 D. As many as there are different tRNAs.
Grazing ungulates are relatively common and burrowing rodents are relatively rare in temperate grasslands
Indicate whether the statement is true or false
All cells have which of the following?
A) capsule B) cell membrane C) cell wall D) nucleus
Heart block is a condition in which the SA node is properly functioning but the atria and ventricles are contracting out of synch. Which of the following statements explains why this happens?
A) The SA node is working extra hard to make the ventricles catch up. B) The heart valves are allowing blood to flow backward through the heart. C) The AV node is not sending signals to the ventricles as it should. D) The coronary arteries are not delivering blood to the heart.