How do most motor proteins ensure their movements are unidirectional?

A.) they couple a conformational change to a thermodynamically unfavorable reaction
B.) they couple a conformational change to the hydrolysis of an ATP molecule
C.) they couple a conformational change to the formation of an ATP molecule from ADP and Pi
D.) they hydrolyze their bound GTP, effectively preventing movement in the reverse directoin
E.) their asymmetrical structures support movement in only one direction


Ans: B.) they couple a conformational change to the hydrolysis of an ATP molecule

Biology & Microbiology

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Organic molecules have a carbon backbone and _____ such as -OH and -NH2 that affect their chemical properties. 

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The hormone leptin is produced by ____________________ cells

Fill in the blank(s) with correct word

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In animal cells, hydrolytic enzymes are packaged to prevent general destruction of cellular components. Which of the following organelles functions in this compartmentalization?

a. chloroplast b. lysosome c. central vacuole d. peroxisome e. glyoxysome

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Two men may be the father of a child. Figure 8.2 shows the results of a DNA fingerprint analysis to determine paternity. M is the mother, C is the child, A and B are the two men. What is the best interpretation of these results?

A. The man identified as A is probably the father. B. The man identified as B is probably the father. C. Neither man is this child's father. D. Either man could be this child's father. E. Paternity cannot be determined from this data.

Biology & Microbiology