Which organisms stain as either Gram-positive or Gram-negative?

a. Bacteria
b. Mercaria
c. Archaea
d. Eukarya


Answer: a. Bacteria

Biology & Microbiology

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The digestive enzyme pepsin works in the acidic environment of the stomach to hydrolyze peptide bonds. As a result, pepsin affects which macromolecule?

A. carbohydrate B. protein C. DNA D. lipid

Biology & Microbiology

The transfers of motor, sensory, and cognitive information between the brain hemispheres is facilitated by the major neural connection between the right and left hemispheres of the human brain. This "bridge" is called the

A. corpus callosum. B. basal nuclei. C. thalamus. D. reticular formation. E. motor cortex.

Biology & Microbiology

Which of the following would be an advantage of using a light microscope instead of an electron microscope?

a. Light microscopes, because they use light, offer greater resolution than electron microscopes. b. Light microscopes are designed to offer more magnification than electron microscopes. c. Living cells can be examined with a light microscope. The method of preparing cells for an electron microscope kills the cells. d. With a light microscope, both the surface characteristics and the internal characteristics of a cell can be examined and no special stains are required.

Biology & Microbiology

What portion of the cell contains microtubules and microfilaments?

a. nucleus b. mitochondria c. cytoskeleton d. smooth ER e. rough ER

Biology & Microbiology