Heartburn is caused by the action of _______ on the ______

a. acid; esophagus
b. acid; stomach
c. mucus; heart
d. proteolytic enzymes; esophagus
e. proteolytic enzymes; stomach


A; Heartburn may be sensed in the vicinity of the heart, but it is caused by stomach acid leaking through the cardiac sphincter into the esophagus, which does not have a lining designed to resist acid.

Biology & Microbiology

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Imagine you are tracing the history of biological evolution. Arrange the following historical figures in

order of when their contribution influenced thoughts on the subject (directly or indirectly). Write the letter of the earliest next to 1, the letter of the most recent next to 8.

A. Lamarck B. Wallace C. Futuyma D. Mendel E. Buffon F. Aristotle G. Lyell H. Malthus 1. 2. 3. 4. 5. 6. 7. 8.

Biology & Microbiology

In DNA, adenine only pairs with _____.

A) thymine B) cytosine C) guanine D) uracil

Biology & Microbiology

A particular trait is analyzed using a pedigree diagram. More males than females appear to be affected. This trait is probably:

a. autosomal dominant. b. autosomal recessive. c. sex-linked dominant. d. sex-linked recessive. e. None of the above

Biology & Microbiology

What is the difference between a food chain and a food web?

What will be an ideal response?

Biology & Microbiology