The effector molecule that binds to the activator of the lac operon is:
A. lactose.
B. glucose.
C. cAMP.
D. allolactose.
C
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The pre-natal period begins with the ____
a. zygote b. blastocyst c. embryo d. fetus e. infant
The reason that many plasmids used in laboratories for transformation experiments contain an ampicillin resistance gene (ampR) is
A) so that the plasmid can replicate in bacterial cells. B) so that the plasmid can recombine with the bacterial genome. C) to enable the recipient cell to conjugate. D) to provide a selectable marker. E) to map point mutations.
Which of the following is NOT true about reverse transcriptase?
A. In RNA viruses it uses a DNA intermediate to make more RNA B. It does not enable HIV to infect the cells C. It can be found in DNA and RNA viruses D. It is a type of polymerase E. In DNA viruses it uses an RNA intermediate to make more DNA
Choose the letter of the best match from the following:A. hypocotylB. endospermC. scutellumD. radicleE. epicotylThe part of the stem axis that extends above the cotyledons in some seedlings.
Fill in the blank(s) with the appropriate word(s).