Which of the following statements about cells is true?
A) All cells have cell walls.
B) All cells have internal structures that move.
C) All cells are attached to other cells.
D) All cells are motile.
Answer: B
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Steroid hormomes are an example of an effector which regulates regulatory transcription factor activity
Indicate whether the statement is true or false
________ carbon atoms allow for the formation of ________, which are mirror images of each other.
Fill in the blank(s) with the appropriate word(s).
Which of the following is an enzyme that breaks hydrogen bonds?
a. helicase b. telomerase c. DNA polymerase d. DNA ligase
In mammals, a decrease in body temperature results in which of the following responses?
(A) Release of thyroxine decreases the rate of metabolism. (B) Blood vessels close to the surface of the skin constrict. (C) vessels in deep muscles constrict so Increased secretion of epinephrine restricts the amount of sugar released into the circulatory system. (D) The adrenal glands increase the release of acetylcholine into the circulatory system. (E) Blood that heat is conserved