In the preceding experiment, bacteria that form blue colonies on X-gal/IPTG LB agar containing antibiotic also contain

(a) a gene for antibiotic resistance.
(b) an active lacZ gene.
(c) an inactive lacZ gene.
(d) both a and b.


(d) both a and b.

Biology & Microbiology

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A fertilized, diploid egg is called a ____

Fill in the blank with the appropriate word.

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What is the vulva?

What will be an ideal response?

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A collection of host cells that house cloned fragments representing expressed genes is (a) ____

a. cDNA library. b. transcribed library. c. genomic library. d. RNA library. e. plasmid library.

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Why are gymnosperms considered to be "naked seed" plants?

A) Their seeds have a thin layer of endosperm. B) They do not produce seeds; they produce only spores. C) Their seeds are not enclosed within ovaries. D) Their seeds develop on the surface of sporophytes.

Biology & Microbiology