Embryonic cell cycles allow the rapid division of cells in the early embryo. These mitotic cell cycles are much shorter in length than the mitotic cell cycles of cells in a mature organism. In the embryonic cell cycles, mitosis takes approximately the same amount of time as it does in the cell cycles of mature cells. What do you think is a result of the embryonic cycle?
A. Resulting daughter cells do not contain the same genetic information as the mother cell in the embryonic cell cycles.
B. Resulting daughter cells cannot form a mitotic spindle in the embryonic cell cycle.
C. Resulting daughter cells are smaller than the mother cell in the embryonic cell cycles.
D. Mother cells in the embryonic cell cycle spend the majority of their time in G0.
Answer: C
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Which of the following best describes the route of water into the water vascular system of a starfish?
A. Water enters through the madreporite into the ring canal and from thence into the radial canals to the ampullae and finally into the tube feet. B. Water enters the madreporite into the radial canals and from thence into the ring canal, then the ampullae and finally into the tube feet. C. Water enters the madreporite into the ampullae and from thence into the ring canal, then the radial canals to the ampullae and finally into the tube feet. D. Water enters the ampullae and then goes to the tube feet and from thence to the radial canals, then the ring canal, and finally exits through the madreporite. E. Water enters the ring canal, then goes into the radial canals, and finally through the madreporite to the ampullae and tube feet.
The process that forms the electrochemical gradient during photosynthesis is the
A. pumping of H+ into the thylakoid lumen. B. hydrolysis of ATP. C. movement of water by osmosis. D. production of water from oxygen in the thylakoid lumen. E. production of H+ in the stroma during NADPH production.
Structures that appear along the synaptonemal complex during pachytene where genetic material is exchanged between nonsister chromatids are the ________.
A) chiasmosomes B) telomeres C) centromeres D) recombination nodules E) kinetochores
How does urban sprawl directly or indirectly affect human health?
A. Traffic and congestion during a long commute increases air pollution. B. More time in the car means less time to exercise (i.e. walk or bike). C. Many children now grow up without the experience of roaming through woods and fields; this is known as Nature Deficit Disorder. D. All of the above are correct. E. Urban sprawl has absolutely no effect on human health. No studies have ever been done to examine this.