What is the main prerequisite for clearance at the G2 checkpoint?
a. cell has reached a sufficient size
b. an adequate stockpile of nucleotides
c. accurate and complete DNA replication
d. proper attachment of mitotic spindle fibers to
Answer: c. accurate and complete DNA replication
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Vasectomy causes sterility because ____
a. sperm is no longer produced b. sperm is unable to leave the testis c. sperm is unable to reach the vas deferens d. sperm is unable to reach the urethra e. semen is no longer produced
Which of the following is the least common ecosystem on Earth?
a. Freshwater b. Terrestrial c. Shallow ocean d. Deep ocean bottom
Which type of study observes specific human populations for unusually high levels of a disease?
A) a case-control study B) a cross-sectional survey C) an ecological study D) a correlational experiment
Chromatin is
A. immature nucleoplasm. B. a cytoplasmic organelle. C. the arrangement of proteins. D. uncoiled DNA of a chromosome.