LUCA, the last universal common ancestor, is:
A. a prehistoric protozoan cell.
B. an embryonic cell (in fetus).
C. the simplest bacterial cell.
D. a cell from which all organisms descended.
D
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Suppose a new species of bacterium is discovered. It contains a form of DNA pol III that can add new nucleotides to either the 5' end or the 3' end of an existing strand. All other properties of the enzyme remain unchanged. How would DNA replication in these bacteria differ from normal replication?
A. Both new strands could be synthesized continuously like the leading strand. B. The same polymerase molecule could synthesize both strands at the same time. C. Helicase would no longer be required for replication. D. DNA gyrase would no longer be required for replication. 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 DNA replication? 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?
All plant organs (such as leaves, roots, and stems) contain tissues from all three tissue systems.
Answer the following statement true (T) or false (F)
In this STD, symptoms include warts on the
genitals and can lead to cervical and anal cancers. This STD is
a. gonorrhea. b. siphilis. c. chlamydia. d. genital herpes. e. HPV infection
Suppose a segment of DNA contains five restriction sites for a particular restriction enzyme. How many fragments of DNA will remain after the enzyme is used to cut the DNA?
A.) 4 B.) 5 C.) 6 D.) 10