To map genes of a bacterial strain, conjugation must be interrupted at given times
Suppose you have Hfr cells of genotype a+b+c+d+e+strR and F– cells of genotype a–b–c–d–e–strS and you combine these two cultures in liquid medium in four blenders at time 0. After intervals of 3, 6, 9, and 12 minutes, you turn on successive blenders. What role does the blender play in the experiment? A) serves as a culture container only
B) acts as a mechanism to bring cells into contact
C) speeds up molecular movement of DNA
D) shears the sex pili of conjugants
E) hastens conjugation events
C
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Alcohol is the end product of fermentation by what type of organism?
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Which of the following is a characteristic of uracil?
a. It has the ability to bond with adenine. b. It has the ability to bond with guanine. c. It is a purine. d. It has the ability to bond with cytosine. e. It contains two nitrogenous rings.
The double strands of DNA separate from each other at high temperatures. G–C rich strands of DNA will re-quire a relatively higher temperature to separate because ___________
What will be an ideal response?