Neutral mutations tend to accumulate in DNA at a
predictable rate; like the ticks of a __________, they
can help researchers estimate how long ago two
lineages diverged. Fill in the blank(s) with the appropriate word(s).
Answer: molecular clock
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A(n) ____ environment is ideal for plant cells, while a(n) ____ environment is best for animal cells
a. isotonic; hypotonic b. hypotonic; isotonic c. hypotonic; hypertonic d. hypertonic; isotonic e. isotonic; isotonic
When proteins are used as energy sources, their breakdown subunits usually enter ____
a. glycolysis b. electron transfer chain c. the Krebs cycle d. alcoholic fermentation e. lactate fermentation
How is cytokinesis in plant cells different from cytokinesis in animal cells?
A. Cytokinesis in plant cell results in one large cell with two nuclei; cytokinesis in animal cells results in two cells, each with one nucleus. B. Cytokinesis in plant cells results in haploid cells; cytokinesis in animal cells results in diploid cells. C. Cytokinesis in plant cells occurs during G2; cytokinesis in animal cells occurs in the M phase of the cell cycle. D. Cytokinesis in plant cells requires formation of a cell plate; cytokinesis in animal cells requires formation of a ring of actin.
Which of the following is an example of a negative feedback mechanism in regards to hormone regulation?
A. A baby suckles in order to stimulate milk production. B. ADH is released from the pituitary causing water to be reabsorbed in the kidneys. C. The uterine contractions during labor stimulate oxytocin production. D. All of these are examples of a negative feedback mechanism. E. None of these are examples of a negative feedback mechanism.