The two molecules that alternate to form the backbone of a polynucleotide chain are:a

adenine and thymine.
b. cytosine and guanine.
c. sugar and phosphate.
d. base and sugar.
e. base and phosphate.


C

Biology & Microbiology

You might also like to view...

Small circles of DNA called __________ exist in addition to the bacterial chromosome

a. capsids b. plasmids c. chromatids d. pili e. centromeres

Biology & Microbiology

An unprotected area of naturally occurring plant and animal assemblages that is surrounded by unsuitable territory due

to development or habitat destruction is referred to by biologists as: a. an island. b. ex situ conservation. c. a reserve. d. a park. e. a refuge.

Biology & Microbiology

An organism that has behavioral strategies to manage the gain of heat from and the loss of heat to the environment, but lacks a physiological temperature-regulating mechanism, is termed a(n)

What will be an ideal response?

Biology & Microbiology

You take a sample of bacteria with DNA that contains only 14N and allow them to replicate in a medium that contains only 15N.  After 3 rounds of replication, what percent of the DNA molecules will contain one strand with only 14N and one strand with only 15N?  Enter your answer as a whole number without the percent sign.  For example, 5% would be entered as 5 and 37% would be entered as 37.  

What will be an ideal response? Clarify Question · What is the key concept addressed by the question?   · What type of thinking is required?   · What key words does the question contain?   Gather Content · What do you already know about the Meselson-Stahl experiment?   Consider Possibilities · What other information is related to the question? Which information is most useful?   Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?   Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?

Biology & Microbiology