DNA polymerases ____.
A. seal gaps in the sugar-phosphate backbone
B. add new nucleotides to a strand
C. catalyze carbon bonding
D. assemble new strands in both direction
E. repair DNA
Answer: B
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Carrier proteins are saturated at which point?
The diagram shows the rate of diffusion into a cell using carrier proteins.
A. 1
B. 2
C. 3
D. 4
Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
Gather Content
· What do you know about carrier proteins? What other information is related to the question?
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which of the following best describes the development of sexual structures in mammals?
A. Embryos develop male structures only once the SRY gene on the Y chromosome. becomes active; if SRY is not present, they develop female structures. B. Embryos initially develop female structures, but these degenerate and male structures develop once SRY becomes active. C. Embryos initially develop both male and female structures; once SRY becomes active, female structures degenerate and male structures continue to develop. D. Embryos initially develop male structures; if SRY is not present, these degenerate and female structures develop. If SRY is present, they continue to develop. E. None of these accurately describes the development of sexual structures in mammals.
Which statement best describes the activity of the sodium-potassium pump?
a. It transports hydrogen ions out of the cell. b. It transports water directly out of the cell. c. It transports 2 sodium ions into the cell in exchange for 3 potassium ions. d. It transports 3 sodium ions out of the cell in exchange for 2 potassium ions. e. It transports 2 sodium ions out of the cell in exchange for 2 potassium ions.
Which type of leishmaniasis is an important opportunistic infection associated with HIV?
a) Cutaneous b) Mucocutaneous c) Visceral d) Systemic