Why do sex hormones and other steroids take much longer to produce their effects than nonsteroid hormones do?
A) Steroids are bigger, slower molecules.
B) Steroids must usually be carried longer distances by the blood.
C) Steroids must relay their messages via relay molecules.
D) Steroids cause target cells to make new proteins, which takes time.
D
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The five steps listed below are part of the cross-bridge cycle
1. The myosin head binds to actin. 2. The myosin head is cocked back through the hydrolysis of ATP. 3. The actin filament slides relative to the myosin filament. 4. The myosin head binds ATP. 5. The myosin head detaches from the actin. Which of the following lists the steps in the correct order? A. 4, 5, 2, 1, 3 B. 1, 4, 2, 3, 5 C. 1, 2, 3, 4, 5 D. 5, 4, 1, 2, 3 E. 2, 1, 3, 5, 4
For the polymerase chain reaction to occur,
a. isolated DNA molecules must be primed. b. all DNA fragments must be identical. c. the DNA must remain double stranded. d. a sticky end must be available for the ligase enzyme to function. e. all of these must occur
The main source of fuel for more than 30 minutes of
muscle contraction is a. fatty acids. b. glucose. c. glycogen. d. creatine phosphate. e. glycerol.
Mammals are thought to have evolved from
A. dinosaurs. B. marsupials. C. archosaurs. D. therapsids. E. thecodonts.