Millions of years ago, the activity of which cellular organelle would have been dependent upon the

presence of cyanobacteria?
a. Golgi
b. nucleus
c. ribosome
d. endoplasmic reticulum
e. mitochondrion


E

Biology & Microbiology

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Muscle fibers generate maximum force:

A. at intermediate lengths. B. when pulled to long lengths before contraction. C. when contracting at short lengths. D. when the myosin filaments contact the Z discs. E. when the overlap between actin and myosin is minimal.

Biology & Microbiology

The polymerase chain reaction is used to

A. amplify certain sections of DNA. B. amplify mRNA. C. produce proteins. D. produce long polymers of carbohydrates to be used in electrophoresis.

Biology & Microbiology

In mammals, a decrease in body temperature results in which of the following responses?

(A) Release of thyroxine decreases the rate of metabolism. (B) Blood vessels close to the surface of the skin constrict. (C) vessels in deep muscles constrict so Increased secretion of epinephrine restricts the amount of sugar released into the circulatory system. (D) The adrenal glands increase the release of acetylcholine into the circulatory system. (E) Blood that heat is conserved

Biology & Microbiology

Because the two strands of a DNA molecule are ________ to each other, either one can be used as a template to reconstruct the other.

A. bound B. identical C. antiparallel D. complementary

Biology & Microbiology