Explain the importance of checkpoints to the cell cycle
What will be an ideal response?
The cell cycle operates in a manner similar to many systems in the human body, in that it responds to internal and external information. In the case of the cell cycle, internal sensors relay information about whether the cell is ready to proceed to the next step in the cell cycle. If the sensors detect problems, then the cycle may be delayed or stopped entirely. A lack of nutrients is an example of an external influence. Multiple checkpoints can exist depending on the cell type and age to help regulate the pace at which the cell cycle operates.
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In a population in Hardy-Weinberg equilibrium, 75 percent of the individuals have a dominant allele for a particular gene (p=0.75) and 25 percent have a recessive allele (q=0.25). The proportion of homozygous recessive individuals in the F1 generation will be
A) 2.5%. B) 6.25%. C) 18.75%. D) 0%.
Haversian (central) canals are characteristic of which tissue?
a. adipose b. bone c. cartilage d. epithelial e. muscular
The crust of our planet that is made of rock and soil is known as the:
a. hydrosphere b. ecosphere c. biosphere d. lithosphere e. atmosphere
You are reading the journal of an amateur naturalist who visited the Sonoran Desert in the last century. Which of his descriptions of desert plants would you question?
A) a plant whose seeds will not germinate unless soaked B) a perennial that flowers only after years of vegetative growth and produces a large number of seeds C) a late winter hillside covered with wildflowers D) a common annual that produces one large seed per plant