Nails are composed of ____.
a. melanin
b. hemoglobin
c. keratin
d. sebum
e. carotene
Answer: c. keratin
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The three major parts of a cell are
A. the nucleus, nucleolus, and nuclear envelope. B. the nucleus, cytoplasm, and cell membrane. C. microtubules, ribosomes, and centrosomes. D. the endoplasmic reticulum, Golgi apparatus, and vesicles.
The gonads
A. secrete sex hormones. B. are dormant until puberty. C. produce gametes. D. are the male testes and female ovaries. E. All of the choices are correct.
If you were suddenly in a dangerous situation, which of your major endocrine glands would you expect to be activated to secrete hormones?
A. Pituitary gland B. Hypothalamus C. Adrenal gland D. Thyroid gland E. All of these endocrine glands would likely be activated during a dangerous situation.
The largest lymph organ in the human body is the _______.
A. liver B. spleen C. thymus D. intestine