Which type of plant hormone appears to play a major role in gravitropism in roots and shoots?
a. salicylic acid
b. gibberellins
c. abscisic acid
d. auxins
e. oligosaccharins
D
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When UV radiation damage occurs, DNA repair occurs only in the absence of template instruction
Indicate whether the statement is true or false.
Sponge larvae:A
are miniature sponges that float about in the plankton. B. crawl along the bottom like an amoeba. C. are flagellated and able to swim. D. bud off the adult sponge. E. float out of the adult, fall to the bottom, and attach to form a new sponge.
If all extant organisms have cells, what does this imply about LUCA? Why?
What will be an ideal response?
Primates need to groom their fur for parasites. Grooming can be either done cooperatively by another indi-vidual or individuals can groom themselves. Grooming oneself requires more time and energy than grooming another individual
Assume that during an encounter only one individual grooms the other, and that this action would have to be reciprocated at a future encounter. What, according to game theory, is the best strategy if individuals know that they will meet exactly twice in their lifetime? a. to groom the other individual; this action will be reciprocated at the second encounter b. not to groom the other individual; with a fixed number of encounters, there are no repercus-sions for the second individual not returning the favor c. not to groom the other individual; cooperation is always the worst strategy in this system re-gardless of whether the number of future encounters is known or not d. to groom the other individual; cooperation maximizes the average benefit for both individuals