A researcher inserted DNA fragments from an organism into plasmids and introduced the modified plasmids into bacterial cells. Which of the following methods would be an effective means of identifying which clones contain a specific gene of interest?
A) Sequence the DNA of the plasmids from each isolate.
B) Use a microarray to detect a transcript of the gene.
C) Isolate clones that still have the vector's genetic marker.
D) Assay for activity of the gene product.
E) Use a northern blot to detect the mRNA of the gene.
A
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Which of the following molecules is not considered a porphyrin?
A. Hemoglobin B. Peptidoglycan C. Vitamin B12 D. Chlorophyll
Sperm cells form within a rounded structure called ____ in bryophytes and some other plants
a. antheridium b. stoma c. strobilus d. sporangium e. archegonium
Which of the following statements is incorrect regarding DNA and RNA?
A. One of the bases is different. B. DNA is double stranded, and RNA is a single strand. C. They each contain a slightly different sugar molecule. D. All of the above are correct.
Repressors
a. bind to operators. b. lie between operators. c. lie between promoters. d. lie downstream from operators. e. are part of an operon.