Which of the following causes heartburn?

a. the pyloric sphincter remaining too tightly closed
b. the gastroesophageal sphincter remaining a little open
c. the pyloric sphincter remaining a little open
d. the gastroesophageal sphincter remaining too tightly closed


Answer: b. the gastroesophageal sphincter remaining a little open

Biology & Microbiology

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Enzyme induction occurs

A) when the substrate is present. B) when the organism is environmentally stressed. C) continuously. D) when the substrate is depleted.

Biology & Microbiology

Examine Figure 44.1 in your text. According to this phylogeny, which of the following correctly lists the sequence in which multicellularity, tissues, and bilateral symmetry arose, from the oldest character to the most recent character?

A. multicellularity, tissues, bilateral symmetry B. multicellularity, bilateral symmetry, tissues C. tissues, bilateral symmetry, multicellularity D. tissues, multicellularity, bilateral symmetry E. That information cannot be determined from the phylogeny.

Biology & Microbiology

Which of the following base changes in DNA is an example of a transition?

A. A to T B. A to G C. C to A D. G to C E. A to C

Biology & Microbiology

The resolution of a microscope is a function of the ________ of the lenses and the ________ of light

A) curvature, color B) curvature, wavelength C) numerical aperture, wavelength D) numerical aperture, intensity E) convex shape, intensity

Biology & Microbiology