A nonreciprocal crossover causes which of the following products?
A) deletion only
B) duplication only
C) nondisjunction
D) deletion and duplication
D
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Which of the following is the single most important stage when regulating gene expression?
a. translational regulation b. degradation of mRNA c. initiation of transcription d. RNA interference e. removal of masking segments
Who first confirmed that the replication of DNA was semiconservative?
a. Chargaff and Hershey b. Watson and Crick c. Avery and Griffith d. Meselson and Stahl e. Watson, Crick, and Wilkins
A traditional technique used to quantify specific types of microbes in natural samples, enrichment cultures, and food or water samples is known as the ________ ________ ________ technique.
Fill in the blank(s) with the appropriate word(s).
Before chromosomes segregate in M phase, they and the segregation machinery must be appropriately prepared. Indicate whether the following statements are true or false. If false, change a single noun to make the statement true
A. Sister chromatids are held together by condensins from the time they arise by DNA replication until the time they separate at anaphase. B. Cohesins are required to make the chromosomes more compact and thus to prevent tangling between different chromosomes. C. The mitotic spindle is composed of actin filaments and myosin filaments. D. Microtubule-dependent motor proteins and microtubule polymerization and depolymerization are mainly responsible for the organized movements of chromosomes during mitosis. E. The centromere nucleates a radial array of microtubules called an aster, and its duplication is triggered by S-Cdk. F. Each centrosome contains a pair of centrioles and hundreds of ?-tubulin rings that nucleate the growth of microtubules.