Which statement about the plasma membrane is true?
a. It appears trilaminar under a light microscope.
b. Its glycocalyx serves as receptor sites for binding chemical messengers in the ECF.
c. It is impermeable to lipid-soluble substances.
d. Some of its carriers transport ions.
e. Its channels are impermeable to any substance smaller than 0.8 nm in diameter.
D
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Atom X has 17 protons. How many electrons are in its valence shell?
A) 3 B) 5 C) 7 D) 10
Neural tissue is formed by the ________
A) ectoderm B) endoderm C) mesoderm D) epiderm
Three to five times a week, you should ________.
A. watch TV B. play computer games C. take long walks D. bowl
How would a decrease in the number of megakaryocytes affect blood composition?
A. A decrease in megakaryocytes would decrease the number of platelets in the blood. B. A decrease in the number of megakaryocytes would decrease the number of leukocytes in the blood. C. A decrease in the number of megakaryocytes would decrease the number of immunoglobulins in the blood. D. A decrease in the number of megakaryocytes would decrease the number of fibrinogens in the blood.