The GAL gene system in yeast is used to metabolize galactose. In the presence of galactose, the GAL genes are expressed; however, in the absence of galactose, the GAL genes are repressed. A yeast mutant is discovered that continuously expresses the GAL
genes in the presence or absence of galactose. Which GAL gene is likely mutated?
A) GAL3 B) GAL4 C) GAL1 D) GAL 10 E) GAL180
Answer: E
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Which of the following statements is true of
metabolic pathways? a. They are enzyme-mediated sequences of reactions. b. They may be biosynthetic or degradative. c. Photosynthesis is a biosynthetic pathway. d. Catabolism is a degradative pathway. e. All of these are true.
Which of the classes of RNA molecules carries the amino acids that are added to the growing polypeptide chain?
a. ribosomal RNA b. transfer RNA c. messenger RNA d. primary mRNA transcript e. ribozyme
RNA cannot be cloned directly. ________, a viral enzyme, is used to convert single-stranded RNA
into ___________ for cloning. Fill in the blank(s) with the appropriate word(s).
When you look at a picture of a dog and then correctly identify it, what have you done in your conscious mind?
A) perception B) photoreception C) podsolization D) proprioception