_____ are signaling molecules that travel through the blood to target cells
a. Hormones c. Local signaling molecules
b. Neurotransmitters d. all of these
A
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Which of the following molecules stabilizes the cell membrane during coated pit formation?
A) mannose-6-phosphate B) KDEL signals C) clatherin D) botulinum toxin E) stabilin
Crows feeding on whelks drop the whelks from the air until their shell breaks, allowing the crows to eat the mussel inside. What factor(s) is/are important for crows optimizing this foraging strategy?
A. the force of gravity in each drop and the height per drop B. the force of gravity in each drop C. the number of drops needed to break the shell D. the height per drop E. the number of drops needed to break the shell and the height per drop
Sponges are believed to have arisen from the choanoflagellates because they possess:a
amebocytes. b. collar cells. c. spongin. d. spicules. e. oscula.
The nitrogenous base that is only found in RNA and not DNA is:
A. uracil B. guanine C. adenine D. thymine E. cytosine