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
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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.
________ is an electron carrier similar to NADH.
Fill in the blank(s) with the appropriate word(s).
Prevention of low back pain is a benefit of increased flexibility.
a. true b. false
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