What is the outcome of the process illustrated in the accompanying figure.?
a. One male and one female cell
b. Four new but genetically distinct cells
c. Two new but genetically distinct cells
d. Two new genetically identical cells that differ genetically from what they were before
e. Four new genetically identical cells that differ genetically from what they were before
d
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Which of the following is not true of the imprinting of the mammalian gene for insulin growth factor-2 (IGF-2)?
A. CTCF binds to the methylated IGF2 gene insulator. B. IGF2 gene is activated when the insulator is methylated. C. The maternally inherited copy of IGF2 is normally repressed in egg cells. D. The insulator of both the paternal and maternal IGF2 alleles lies between the promoter and the enhancer.
Answer the following statements true (T) or false (F)
1. Glycolysis involves 10 enzyme-catalyzed steps, that can be grouped into three phases: energy investment phase, cleavage phase, and the energy liberation phase. 2. The electron transport chain consists of a series of redox reactions in which electrons are transferred to oxygen as the final electron acceptor. 3. Oxygen is an excellent final electron acceptor because of its low electronegativity. 4. NADH and FADH2 donate their electrons to protein complex I. 5. Ubiquinone is also known as coenzyme Q.
Parasites impact host populations by
a. draining nutrients from hosts. b. making hosts more vulnerable to predation. c. lowering birth rates and raising death rates. d. causing sterility e. all of these.
During which phase does transcription stop, and the DNA begin to appear grainy and start to condense?
a. interphase b. early prophase c. prophase d. anaphase e. early anaphase