Genes produce their products nonstop, 24-hours a day.

a. true
b. false


b. false
Genes can be turned off and on from day to day or hour to hour.

Biology & Microbiology

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In a typical application, a DNA microarray is used to compare the ____________________

a. expression of genes in two different tissues b. alleles of each chromosome c. length of DNA fragments in yeast vectors d. changes in gene sequences within an allele through generations of a single family e. protein products produced when using different DNA sequencing techniques

Biology & Microbiology

Select the best response to the question. ?Candida infection should be suspected in which of the following situations?

A) a patient with cracking and peeling skin between the toes B) a patient with a lung infection from inhaling soil spores where bats and birds are roosting C) an AIDS patient diagnosed with esophagitis D) a patient with ring-shaped skin lesions

Biology & Microbiology

Besides being selectively permeable and regulating transport the cell membrane is also involved in

A) secretion. B) storage of wastes. C) storage of DNA. D) Gram stain reactions.

Biology & Microbiology

Which is the only major phylum of animals that lack nerves?

A. cnidarians B. sponges C. platyhelminthes D. nematodes E. mollusks

Biology & Microbiology