What is a target cell?
What will be an ideal response?
A cell that has receptors for a specific hormone
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Some green algae exhibit alternation of generations. All land plants exhibit alternation of generations. No charophytes (stoneworts) exhibit alternation of generations
Keeping in mind the recent evidence from molecular systematics, the correct interpretation of these observations is that _____. A) charophytes are not related to either green algae or land plants B) plants evolved alternation of generations independently of charophytes C) alternation of generations cannot be beneficial to charophytes D) land plants evolved directly from the green algae that perform alternation of generations E) scientists have no evidence to indicate whether or not land plants evolved from any kind of alga
For sodium to accumulate rapidly inside a neuron cell membrane,
a. a stimulus above the threshold must open sodium gates in an accelerating manner. b. the wave of repolarization must occur to reestablish a resting potential. c. there must be a dramatic increase in the negative charge of the cytoplasm. d. a voltage surge must cause the sodium gates to close. e. the potassium gates must open first.
Animals with a crown of cilia that look like a spinning wheel are the:A
bryozoans. B. phoronids. C. ctenophores. D. rotifers. E. platyhelminthes.
The Cas9 nuclease is able to cleave target DNA at a single precise site by ________.
A. recognizing a palindromic sequence on the DNA and cleaving at that site leaving sticky ends B. associating with a single-stranded DNA molecule that binds to its complement on the genome to be cleaved C. using a guide RNA that hybridizes to a unique sequence on the target DNA molecule D. altering its active site to bind to and cleave any DNA sequence that is targeted