The hormone that is antagonistic in action to
glucagon is
a. norepinephrine.
b. insulin.
c. thyroxine.
d. epinephrine.
e. mineralocorticoids.
Answer: b
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Mycoplasma
A. lack peptidoglycan. B. are the smallest free-living organisms. C. have sterols in their membranes. D. are killed by penicillin. E. lack peptidoglycan, are the smallest free-living organisms AND have sterols in their membranes.
Assuming geological evidence is accurate, life on Earth may have originated
a. 14 billion years ago. b. 4.6 billion years ago. c. 3.5 billion years ago. d. 2.1 billion years ago. e. 1.2 billion years ago.
Embryonic mesoderm forms the:a
epidermis. b. lining of the digestive tract. c. pituitary gland. d. excretory system. e. nervous system
Which of the following is the correct order for the synthesis of the plant cell wall?
A) middle lamella; primary cell wall; secondary cell wall B) primary cell wall; middle lamella; secondary cell wall C) secondary cell wall; primary cell wall; middle lamella D) middle lamella; secondary cell wall; primary cell wall E) primary cell wall; secondary cell wall; middle lamella