Which of these organisms, sometimes called living

fossils, is represented by only one species?
a. horsetails
b. club mosses
c. gnetophytes
d. ginkgos
e. cycads


Answer: d

Biology & Microbiology

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A key influence of the atrioventricular node on the heartbeat is to

A. speed up the conduction of the electrical impulse to contract as it passes from the atria to the ventricles. B. slow down the conduction of the electrical impulse to contract as it passes from the atria to the ventricles. C. act as a barrier that prevents the conduction of the electrical impulse to contract as it passes from the atria to the ventricles. D. not alter the speed at which the electrical impulse to contract passes from the atria to the ventricles. E. block backflow of blood from the aorta into the right ventricle.

Biology & Microbiology

________ is an electron carrier similar to NADH.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Prevention of low back pain is a benefit of increased flexibility.

a. true b. false

Biology & Microbiology

In the eukaryote, the respiratory chain is located in the ___, whereas the majority of ATP is produced by the respiratory chain in the _______ of a prokaryote.

A. Lysosome, flagella B. Golgi body, mitochondria C. Mitochondria, outer membrane space D. Mitochondria, ribosome E. SER, nucleus

Biology & Microbiology