If a couple is planning on having two children, what is the probability that both will be male?
a. 0
b. 1/4
c. 1/2
d. 3/4
e. 1
b
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A population can increase in size as a result of which of the following processes? Select all correct choices
A. an increase in emigration B. an increase in immigration C. an increase in death rate D. an increase in birth rate E. an increase in emigration and death rate F. an increase in immigration and birth rate
Which of the following statements about the electron transport chain in cell respiration is CORRECT?
A. Electrons move from NADH to a chain of proteins with lower electronegativities. B. The electron transport chain of proteins uses ATP to pump H+ across the inner mitochondria membrane against its electrochemical gradient. C. The loss in free energy of the electron initially donated by NADH is used to transport H+ across the inner mitochondrial membrane against its electrochemical gradient. D. The electron transport chain of proteins contains pores that are leaky to H+. E. The ATP synthase pump generates a H+ gradient across the inner mitochondrial membrane.
The sugar component of RNA and DNA nucleotides are synthesized
A. as deoxyribose and then changed to ribose. B. as ribose and then changed to deoxyribose. C. separately. D. using the Calvin cycle. E. as deoxyribose and then changed to ribose AND using the Calvin cycle.
Which of the following is a mismatch?
A. thermoacidophiles - live in high temperatures and acidic environments B. methanogens - prefer anaerobic environments C. thermophiles - live in extremely cold temperatures D. halophiles - live in high salt environments