If you know that a DNA double helix consists of 20 % adenine, what percentage of the DNA double helix is guanine (G)?
A. 20%
B. 80%
C. 30%
D. There is not information to know
Answer: C
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Why is the Lineweaver—Burk plot important in enzyme kinetics?
A) It is a single-reciprocal plot. B) It illustrates enzyme specificity. C) It reveals the presence of prosthetic groups in enzymes. D) It makes it easier to determine Vmax. E) It is nonlinear.
Frogs have two atria, but only a single ventricle.
Answer the following statement true (T) or false (F)
Cryptochrome absorbs blue light. Indicate whether the statement is true or false
Which of the following statements regarding smooth muscle versus striated muscle is false?
A. Calcium for skeletal muscle contraction enters the cell from the sarcoplasmic reticulum and through voltage-gated calcium channels in the plasma membrane, whereas the calcium for smooth muscle contraction enters the cell from the sarcoplasmic reticulum only. B. Smooth muscle contraction is regulated by the binding of calcium to calmodulin, whereas skeletal muscle contraction is regulated by the troponin-tropomyosin system. C. Smooth muscle is activated by the autonomic nervous system, whereas skeletal muscle is activated by the somatic nervous system. D. Separate enzymes mediate the binding of myosin to actin through phosphorylation and dephosphorylation in smooth muscle, whereas the myosin heads of skeletal muscle function as enzymes themselves to hydrolyze ATP. E. Smooth muscle contracts longer and relaxes more slowly compared to skeletal muscle.