During prophase II, ____.
A. a new spindle forms
B. crossing over occurs
C. chromosomes are single-stranded
D. the cell is diploid
E. the nuclear envelope re-forms
Answer: A
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Which of the following most accurately describes what is happening along the electron transport chain in the accompanying figure?
A) Electrons are transferred to ADP to generate ATP at each step in the process. B) Each electron carrier alternates between being reduced and being oxidized. C) ATP is generated at each step of the process. D) Energy of the electrons increases at each step of the process. E) Molecules in the chain give up some of their potential energy.
All living species in the Osteichthyes clade have endoskeletons composed entirely of cartilage
a. True b. False
Argentine fire ants entered the United States in the
a. 1920s. b. 1930s. c. 1940s. d. 1950s. e. 1960s.
What feature/s is/are shared by your skin, your lungs and your gut?
A. All are continuous with the outside of the body. B. All are lined by epithelial cells. C. A and B D. Neither A nor B