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
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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?
Small circles of DNA called __________ exist in addition to the bacterial chromosome
a. capsids b. plasmids c. chromatids d. pili e. centromeres
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.
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?