Which type of chemical bond is responsible for zipping together the two strands of a DNA molecule?

a. ionic
b. covalent
c. hydrogen
d. van der Waal interactions


c. hydrogen

Biology & Microbiology

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Transmission of P. shigelloides to humans is by:

a. exposure of disrupted skin and mucosal surfaces to contaminated animal hides. b. ingestion of contaminated seafood or wa-ter. c. inhalation of contaminated air. d. close contact with carriers of the organism.

Biology & Microbiology

A(n) ________ life table is constructed by sampling the population to obtain a distribution of age classes during a single time period

Fill in the blank(s) with correct word

Biology & Microbiology

Cotransductants can be detected when the transduced genes are

A) closely linked. B) far apart on the same chromosome. C) on different chromosomes. D) mutant. E) Both B and D

Biology & Microbiology

When your blood pressure is measured from an artery in your arm, it is a measurement of the pressure produced by your

A) right ventricle. B) right atrium. C) left ventricle. D) left atrium.

Biology & Microbiology