__________ is a field of study concerned with the
origins, evolution, and persistence of life on Earth as
it relates to life in the universe. Fill in the blank(s) with the appropriate word(s).
Answer: Astrobiology
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In what way is cytokinesis in plant cells similar to binary fission in a bacterium?
A. Cell wall material is deposited between the two nuclei to separate the daughter cells. B. A ring of actin filaments constricts the plasma membrane between the two nuclei to separate the daughter cells. C. A microtubulin-like structure constricts the plasma membrane between the two nuclei to separate the daughter cells. D. A motor protein slides microtubules in a contractile ring at the plasma membrane between the two nuclei to separate the daughter cells. E. All of these choices are correct.
Which event occurs during the luteal phase of the menstrual cycle?
a. The corpus luteum forms. b. A zona pellucida forms around the oocyte. c. An oocyte completes meiosis I. d. Estrogen levels increase. e. Testosterone levels increase.
Dilation of blood vessels is regulated by the second messenger
A) cAMP. B) Ca2+. C) IP3. D) CO2. E) NO.
Apoptosis involves all but which of the following?
A) fragmentation of the DNA B) activation of cellular enzymes C) lysis of the cell D) digestion of cellular contents by scavenger cells