Occasionally, chromosomes fail to separate during meiosis, leading to daughter cells that have an abnormal number of chromosomes. This phenomenon is called
A. chromosome inactivation.
B. nondisjunction.
C. crossing over.
D. epistasis.
E. pleiotropy.
Answer: B
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The limitation associated with utilizing the Gram stain procedure includes all of the following except:
a. over decolorizing resulting in all organisms appearing gram negative. b. formation of crystals in the stain appearing as gram-positive rods. c. providing potential life-saving preliminary organism characteristics. d. variable Gram staining characteristics based on organism viability in preparation.
What is required for a group of clones to be considered a contig?
A. the clones need to have nonoverlapping regions of DNA. B. the clones should contain identical regions of DNA. C. the clones should contain completely unique regions of DNA. D. the clones should have overlapping regions of DNA. E. the clones should have identical, nonoverlapping regions of DNA.
For all three types of bryophytes, the spores exhibit what chromosomal condition?
a. diploid b. tetraploid c. haploid d. The spores do not have chromosomes.
Which of the following describes the exchange of gases between a respiratory surface and the
circulatory system?
a. ventilation b. cellular respiration c. perfusion d. bulk flow e. physiological respiration