Fertilization begins when ____
a. sperm enter the uterus
b. sperm enters the secondary oocyte
c. prior to sperm capacitation
d. before the sperm pass through the zona pellucida
e. the egg nucleus produces 46 chromosomes
ANSWER: b
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Which of the following techniques is mismatched with its use in DNA fingerprinting?
A. Restriction endonucleases to cut DNA B. Southern blot for a visual record of DNA fragments C. Electrophoresis to separate DNA fragments D. PCR amplification to get more copies of DNA E. Hybridization probes to digest the DNA sample
In an estuary, the zone of maximum vertical difference in density of water layers is called the
A) thermocline. B) pycnocline. C) mixing zone. D) hypolimnion.
Refer to Figure 50-2. If a cut was made between numbers 6 and 10:
a. seminal fluid would not be produced. b. sperm cells would not be produced. c. sperm maturation would be inhibited. d. the seminal vesicles and the testes would be below the cut. e. None of these.
Which of the following will result when 1% to 5% agar is added to nutrient broth, boiled and cooled?
A. a liquid medium B. a mixed culture C. a solid medium D. a pure culture E. a contaminated medium