Which of the following results from DNA replication during interphase?
a. Each new cell receives half of the number of chromosomes in the original cell.
b. Each new cell receives copies of all the original chromosomes.
c. If the original number of chromosomes was 46, each new cell will have 23.
d. The sister chromosomes are not identical due to breakages in the DNA.
e. All chromosomes are duplicated except the sex chromosomes.
ANSWER: b
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Which of the following statements is false?
a. Cell migration during embryonic development is an example of chemotaxis. b. Embryonic neurons follow adhesive cells as they migrate. c. Cells continue migrating throughout the entire embryonic process. d. Morphogenesis depends upon local growth. e. Controlled cell death can be involved in morphogenesis.
A good hypothesis:a
can be proven to be true. b. is falsifiable. c. can only be tested once. d. is a statement of fact. e. represents important conclusions.
Testosterone is produced by the interstitial cells
____________________ Indicate whether the statement is true or false.
Ionizing radiation can produce which of the following?
A. hypoxanthine B. cytosine C. stop codons D. thymine dimers E. free radicals