How is it assured that the transposition of HML or HMR to MAT is unidirectional?
What will be an ideal response?
Ans: The MAT locus has a 24-bp sequence at its right boundary that is a target for a specific enzyme, the HO endonuclease. Both HML and HMR lack this sequence. This assures that it is MAT that is cleaved, degraded, and replaced by either HML or HMR, which can only act as donor sequences.
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How do scientists determine the annealing temperature used in PCR reactions?
a. It is always 55?C because the DNA polymerase works best at this temperature. b. It is always 55?C because primers anneal best at lower temperatures. c. It is always 60?C because any other temperature would destabilize the DNA. d. It can vary from 55-60?C depending on the primers being used. e. It can vary from 55-60?C depending on the type of DNA polymerase being used.
Homologous chromosomes have the:a
same length but differing genes. b. same shape but differing genes c. the same genes but differing shapes. d. same genes but differing lengths
e. same length, shape, and genes.Traits that are conditioned by multiple loci and form continuously variable phenotypes that are conditioned by both the genotypes and environmental influences are most appropriately termed ________
A) qualitative traits B) quantitative traits C) discrete categorical traits D) Mendelian traits
What is the fluid-filled sac within the inner membrane of a chloroplast called?
a. grana b. lumen c. stroma d. thylakoid e. electron acceptor