Viruses that infect bacteria are called ________.
A. viroids
B. bacteriophages
C. plasmids
D. vectors
Answer: B
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Which statement about rods and cones in the eye is correct?
a. Cones respond to particular wavelengths (colors) of light, while rods perceive light at low intensity without color perception. b. Rods respond to particular wavelengths (colors) of light, while cones perceive light at low intensities without color perception. c. Cones are more sensitive to single photons of light than rods. d. Nocturnal animals have a high concentration of cones and relatively few rods. e. Humans have approximately equal numbers of rods and cones, but the cones are primarily localized in the fovea.
As used in twin studies in mammals, distinguish between the terms concordant and discordant
What will be an ideal response?
Which respiratory organ normally allows both air and food passage?
Select one: a. bronchi b. trachea c. larynx d. pharynx e. nasal cavity
Structural differences between Gram-positive and Gram-negative bacteria are observed following the Gram-staining procedure since ________.
A. the thin layer of peptidoglycan in Gram-positive bacteria is dehydrated during the alcohol step, thus acting as an impermeability barrier allowing the stain to wash out B. the thin layer of peptidoglycan in Gram-negative bacteria is dissolved during the alcohol step, thus acting as an impermeability barrier allowing the crystal violet/iodine complex to be retained C. the thick layer of peptidoglycan in Gram-positive bacteria is dehydrated during the alcohol step, thus acting as an impermeability barrier retaining the crystal violet/iodine complex D. the thick layer of peptidoglycan in Gram-negative bacteria is dehydrated during the alcohol step, thus acting as an impermeability barrier retaining the purple stain