The sequence of genes in each T4 virus within a population is the same but starts with a different gene at the 5' end. If each of these linear pieces is circularized, the gene sequences would be identical. The T4 DNA, therefore, is described as being
A. a linear repeat.
B. circularly permuted.
C. linearly palindromic.
D. two fold rotationally symmetrical.
Answer: B
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Loeffler's medium inhibits the growth of MOST organisms and is commonly used to cultivate
A) Corynebacterium diphtheriae. B) Mycobacterium tuberculosis. C) Mycobacterium leprae. D) Staphylococcus aureus.
The energy that drives the light-independent reactions comes from ____
a. sunlight b. glucose c. carbon dioxide d. ATP and NADPH e. water and oxygen
The enzyme reverse transcriptase
A) synthesizes DNA to repair gaps in a DNA strand. B) synthesizes DNA from an RNA template. C) synthesizes RNA from an RNA template. D) synthesizes RNA from a DNA template. E) can synthesize DNA or RNA from an RNA template.
You want to design a DNA probe used for hybridization to isolate a clone from a cDNA library. Which of the following concerns about DNA probe design is the most legitimate?
(a) You must be careful when designing your probe to take into account which DNA strand was transcribed in mRNA and choose a probe complementary to the mRNA. (b) You must be careful not to include any DNA sequences in your probe that are upstream (5?) of the AUG start codon. (c) You must make sure that all the DNA sequences in your probe lie within an exon, and do not span two exons. (d) You must make sure that all the DNA sequences in your probe are not located downstream (3?) of the polyadenylation signal.