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
E. the number of drops needed to break the shell and the height per drop
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In many cells, the adhesion to the extracellular matrix through integrins causes the activation of kinases in the cytoplasm. This suggests that:
A. integrins promote the activation of signaltransduction pathways. B. integrins are kinases. C. extracellular matrix proteins are receptors and integrins are ligands.
Questions about ultimate causes of behavior are ____ questions, while proximate questions about behavior are ____
questions.
a. how; why b. what; how c. how; when d. what; who e. why; how
The DNA sequence 5? ATGGGGGACACC 3? encodes the amino acids Met Gly Asp Thr. A mutation changes the sequence to 5? ATGGGGAACACC 3? that encodes the amino acids Met Gly Asn Thr. What type of mutation has occurred?
A) frameshift mutation B) missense mutation C) silent mutation D) nonsense mutation
Meiosis that produces microspores is indicated
by a. A. b. B. c. C. d. D. e. E.