In mitosis, the main difference between plant and animal cells is that
A. plants have a central vacuole, while animal cells do not.
B. plants do not undergo cytokinesis.
C. plants produce a cell membrane in cytokinesis, while animals form a cell plate.
D. in plants, kinetochore microtubules shorten and draw chromosomes toward the poles; in animals, polar microtubules lengthen to push chromatids apart.
E. plants produce a cell plate to segregate the daughter nuclei, while animals form a cleavage furrow.
Answer: E
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Which of the following is not true of the fossil record of life on Earth?
A. Vertebrates such as reptiles or mammals are less likely to leave a fossil record than annelids and flatworms. B. Animal species do not appear in the fossil record for billions of years after the emergence of microorganisms.
Select the correct satement regarding the rate of mutation?
A. Rates of mutation per cell generation typically range from 10-5 to 10-9 B. Mutation rates are consistent across species C. Mutation rates are not influenced by environmental conditions D. Mutation rates are constant
Answer the following statements true (T) or false (F)
1. A single gene always encodes an enzyme. 2. RNA polymerase II of eukaryotes always requires more than one general transcription factor to initiate transcription. 3 The molecule mRNA, which contains the information to make a polypeptide, is constructed from a DNA template. 4. As part of the transcriptional unit, regulatory sequences are the sites where RNA polymerase and transcription factors bind to regulate transcription.
Which of the following is NOT a densitydependent
limiting factor?
a. disease b. parasitism c. lack of living space d. dramatic change in climate e. all of these are density-dependent limiting factors