Ethidium bromide
a. terminates the formation of polynucleotide chains.
b. is used to detect a protein of interest.
c. is a nonspecific stain for nucleic acids.
d. is a nonspecific nuclease.
e. allows DNA polymerase to be thermostable.
Ans: c
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A. They obtain CO2 only through stomata and water through their roots. B. They obtain water through their stomata and CO2 through roots. C. They absorb both CO2 and water directly from the environment, without passing through stomata or roots. D. They have difficulty absorbing water and CO2 due to their thick, waxy cuticle. E. They live in moist environments, so they do not need to absorb water or CO2.
According to the first law of thermodynamics,
a. the energy of a system may increase if there is a corresponding decrease in energy elsewhere in the universe. b. the amount of energy in the universe is constant. c. chemical reactions do not create or destroy energy. d. energy can change from one form to another. e. all of these are true
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a. have to be transported by specific protein carrier molecules in the blood. b. have no trouble entering the target cells. c. find and react with the cell lipid bilayer. d. always elicit the production of a second messenger. e. are the same as lipid soluble.
Certain amino acids are called essential because they ________
A) are required for making protein B) cannot be made by the body from other compounds C) store energy D) are required for making nucleic acids