Which bases are most susceptible to hydrolysis of the glycosidic linkage that connects them to the DNA backbone?
A. adenine and guanine
B. adenine and thymine
C. cytosine and guanine
D. cytosine and adenine
E. cytosine, thymine, and uracil
A
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A vascular bundle:
A. contains xylem and phloem B. is not found in leaves C. is usually scattered in the stem of a eudicot D. is on the outer surface of a root E. is very distinct in the apical meristem
The number of similar anatomical parts called whorls that make up a complete flower is
A. five. B. two. C. one. D. four. E. three.
Why doesn't the gasoline in your car spontaneously ignite into flames? (The reaction of gasoline with oxygen is called
a combustion reaction, and is the reaction that is used to power your car). a. The products of a combustion reaction have more energy than the reactants. b. The gasoline in your car is in an air-tight container, so it cannot react with the oxygen from the air. c. The amount of energy in the bonds of the products exceeds the amount of energy in the bonds of the reactants. d. The reactants of the combustion of gasoline have less energy and the products. e. The gasoline in your car alone cannot overcome the activation energy.
Which of these is the site for protein modification?
a. nucleus b. cytoskeleton c. mitochondria d. rough endoplasmic reticulum e. nucleolus