Define interphase and describe its three stages. What will be an ideal response?
ANSWER: Before cells can divide, they must grow to the size of the parental cell. Growth takes place
during the first stage of interphase, the G1 stage. G1 begins immediately after division;
during this stage, many cytoplasmic components, including organelles, membranes, and
ribosomes, are made. G1 is followed by the S (synthesis) phase, during which a copy of each
chromosome is made. A period known as G2 takes place before the cell is ready to begin a
new round of division.
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In nutrient-rich water, photosynthetic protists may undergo population explosions known as __________. Fill in the blank(s) with the appropriate word(s)
The innermost layer of an embryo, which develops into the digestive system.
What will be an ideal response?
You construct a life table for a plant species and find that in all cases about the same proportion of the cohort survive to the beginning of the next time interval. What would you call this?
A. A Type I survivorship curve B. A Type II survivorship curve C. A Type III survivorship curve D. Populations regulated by density-independent events E. A semelparous life history adaptation
Enzymes that catalyze the removal of carbon dioxide from a substrate are called...
a) phosphotransferases b) oxidoreductases c) decarboxylases d) aminotransferases e) ligases