The progress of the eukaryotic cell cycle is regulated primarily by what proteins?
A. FtsZ
B. cyclins
C. histone proteins
D. condensins
Answer: B
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How would a terrestrial centipede most likely benefit from the ability to close its spiracles? Closing spiracles would _____
A) allow the centipede to move more quickly B) allow the centipede to retain more moisture in its tissues C) allow the centipede to stay warmer D) allow more oxygen from the environment to reach the centipede's tissues E) not benefit the centipede at all
Which of the following it the most typical order of events in seed germination?
a. shoot cells divide and elongate ? root cells divide and elongate ? seed coat splits ? water imbibition b. water imbibition ? seed coat splits ? root cells divide and elongate ? shoot cells divide and elongate c. water imbibition ? root cells divide and elongate ? seed coat splits ? shoot cells divide and elongate d. seed coat splits ? water imbibition ? root cells divide and elongate ? shoot cells divide and elongate e. seed coat splits ? water imbibition ? shoot cells divide and elongate ? root cells divide and elongate
The interval stage before the onset of DNA replication is called the
a. G1 stage. b. G2 stage. c. M stage. d. S stage. e. G3 stage.
Which of the following statements is true of eosinophils?
A) They are in intact skin, sebum, tears, etc. B) They produce the coating of a pathogen by complement. C) They secrete toxins onto the surface of helminth parasites. D) They decline during allergic reaction. E) They release prostaglandins and leukotrienes in response to microbes.