When nutrients are suboptimal for cell growth and division, the cell cycle arrests. At which stage of the cell cycle/checkpoint would you predict this arrest to occur?
A. G1 checkpoint
B. G2 checkpoint
C. M checkpoint
D. G1, G2, and the M checkpoints
E. It is not possible to answer with the
information given.
A
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A genotype refers to
A) the alleles present in an individual. B) expression patterns of certain genes. C) the environmental components of a trait. D) the number of chromosomes that a person has.
Why are the testicles kept outside of the body?
A) They lower the temperature for sperm production. B) The testicles cushion the penis and stop it from hanging too low. C) There's no reason for this. D) Earlier in human evolution, visible testicles helped males to sexually attract females.
How is a pseudocoelom different from a coelom?
a. A pseudocoelom is a cavity not found between tissues. b. A pseudocoelom is a cavity fully lined by mesoderm. c. A coelom is a cavity fully lined by endoderm. d. A coelom is a cavity fully lined by mesoderm. e. A coelom is a cavity between two tissue layers.
Discuss coevolution as it relates to predator-prey interactions. Include a brief discussion of two specific examples. What will be an ideal response?