When individuals of two species interact, the nature of the interaction can be classified qualitatively as positive, negative, or ________
Fill in the blank(s) with correct word
neutral
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Which of the following is the most likely explanation for the band pattern seen in lane 6?
A. Protein D is a restriction enzyme and cut the DNA fragment into two DNA fragments. B. Protein D binding to the CRP-binding site is less tight compared to cAMP-CRP binding. C. Protein D has a smaller mass than the cAMP-CRP protein. D. Protein D removed radioactive label from the DNA fragment.
Place the following events in the order in which they occur for chemical synapse transmission
(1) Ca2+ enters axon terminal. (2) Ligand-gated ion channels open in postsynaptic membrane. (3) Neurotransmitter binds to postsynaptic receptor. (4) Action potential reaches axon terminal of presynaptic neuron. (5) Neurotransmitter released by exocytosis.
a. 4, 1, 5, 3, 2 b. 4, 3, 1, 5, 2 c. 4, 5, 1, 3, 2 d. 4, 1, 3, 5, 2 e. 4, 5, 2, 3, 1
Which statement about promoters is true?
a. They are long sequences in DNA. b. They are locations in DNA where regulatory proteins do not gather. c. They control transcription. d. They are associated with all genes. e. They slow the rate of transcription.
Vertebrate forelimbs evolved through which mechanism?
A. Morphological convergence B. Divergent evolution C. Analogous evolution D. Homologous evolution E. Structural adaptation