What molecule is not an example of a sex steroid hormone?
A. Prolactin
B. Estrogen
C. Testosterone
D. Progesterone
E. Estradiol
Answer: A
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Which of one the following amino acids is not phosphorylated in the C-terminal domain of DNA polymerase II?
A. Phe B. Ser C. Tyr D. Thr E. All of the amino acids given are phosphorylated.
A thin filament of muscle is composed primarily of the protein
A. hemoglobin. B. myosin. C. myoglobin. D. actin. E. pectin.
Which of the following is NOT TRUE concerning
photosystem I? a. It can run independently as a cyclic pathway. b. It runs as a cyclic pathway when too much NADPH is produced. c. Electrons from p700 return to p680 when it runs as a cyclic pathway. d. When it runs as a cyclic pathway, neither NADP+ nor O2 is formed. e. Its energized electrons are used to build a high H+ concentration.
Which one of the following hormone pairs is antagonistic, in that they have opposing effects?
A) estrogen, progesterone B) epinephrine, norepinephrine C) glucagon, insulin D) oxytocin, prolactin E) thyroxine (T4 ) and triiodothyronine (T3 )