Dystrophin is a protein that normally
A. shortens and lengthens to produce muscle contraction.
B. carries signals into muscle cells to initiate contraction.
C. strengthens the attachment between muscle proteins and the plasma membrane.
D. helps provide energy for muscle contraction.
E. signals muscle cells to divide.
C
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Which of the following types of cell junctions are found in skin?
A. adherens junctions B. tight junctions C. desmosomes D. hemidesmosomes E. All of these choices are correct.
Dideoxyribonucleotides (ddNTPs) used for DNA sequencing lack oxygen atoms at ________
A) the 1' carbon of the pentose sugar B) the 1' and 2' carbons of the pentose sugar C) the 2' and 3' carbons of the pentose sugar D) the 3' and 5' carbons of the pentose sugar E) the 5' carbon of the pentose sugar
Which of the following describes the mechanism by which a plant stem grows toward light?
A. The plant seeks light in order to maximize photosynthesis B. nerve like impulses stimulate contractile cells on the lighted side of the stem C. cells on the dark side of he stem elongate more than those on the lighted side D. THe plant grows into an open area where its leaves will not be shaded by competing plants E. the greater energy supply on the lighted side of the stem stimulates metabolism and growth on that side
You are asked to give a classroom demonstration of DNA supercoiling. To do so, you take two different colored pieces of rubber tubing, twist them very tightly and excessively around each other and join the ends of the tubing appropriately. Next, you relieve the supercoiling by breaking one strand and unwinding it. In this demonstration, the breaking and unwinding to relieve the supercoiling simulates the action of
A. polymerases. B. exonucleases. C. primases. D. topoisomerases. E. ligases.