Which of the following is not a characteristic found in Gram-negative bacteria?
A. A peptidoglycan cell wall.
B. An outer membrane composed of lipopolysaccharide.
C. A thick peptidoglycan cell wall that stains purple.
D. They Gram stain pink.
E. Plasmids and antibiotic resistance.
Answer: C
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The main stimulus for phototropism is light of ____ wavelengths
a. red b. green c. yellow d. blue e. far red
Which of the following statements about UV radiation is true?
a. It is necessary for the body to make vitamin B. b. The amount of UV radiation that reaches the Earth's surface is fairly constant. c. The ozone hole is responsible for the Greenhouse Effect, but has no impact on levels of UV radiation. d. Individuals with less melanin suffer less wrinkling and skin cancer. e. Exposure to ultraviolet rays causes the epidermis to thicken and produce more melanin.
Part complete The type of RNA that holds an initial copy of the genetic information is the
a. tRNA. b. rRNA. c. dRNA. d. microRNA. e. mRNA.
Isotopes are atoms of the same element that differ in
A) the number of protons and electrons found in the atom. B) the number of protons found in the nucleus. C) the number of protons and neutrons found in the nucleus. D) the number of electrons orbiting the nucleus. E) the number of neutrons found in the nucleus.