The key structural difference between DNA and RNA is

A. As their names indicate, DNA contains deoxyribose, whereas RNA contains ribose. Thus, DNA contains a different sugar than RNA.
B. RNA is a polymer, but DNA is not.
C. RNA is a protein, while DNA is a nucleic acid.
D. All the bases in DNA differ from those in RNA.
E. RNA is a double helix, but DNA is not.


Answer: A

Biology & Microbiology

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In a single polymerase chain reaction (PCR) cycle consisting of 15 seconds at 94 °C, 30 seconds at 50 °C, and 1 minute at 72 °C, what is happening in the step run at 50 °C?

A) The DNA to be amplified is being denatured. B) Primers are being denatured. C) DNA polymerase is extending new DNA from the primers. D) Primers are annealing to the DNA to be amplified. E) DNA polymerase is being inactivated.

Biology & Microbiology

Placing a ripe apple with other apples that are not ripe will cause the other apples to ripen sooner

Which type of plant hormone is responsible for this effect?

a. brassinosteroids b. ethylene c. auxins d. oligosaccharins e. abscisic acid

Biology & Microbiology

Which plasma membrane component provides mechanical strength and maintains the correct amount for rigidity and flexibility?

A) cholesterol B) phospholipids C) protein D) triglycerides E) carbohydrates

Biology & Microbiology

Organism A has 70 moles % G+C, and organism B has 40 moles % G+C. Which of the following can be concluded from these data?

A) The two organisms are related. B) The two organisms are unrelated. C) The organisms make entirely different enzymes. D) Their nucleic acids will completely hybridize. E) None of the answers is correct.

Biology & Microbiology