During ________ DNA fragments are separated based upon ________
a. DNA sequencing, color
b. electrophoresis, color
c. electrophoresis, size
d. polymerase chain reaction, size
e. genetic analysis, size
c
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Indicate the scenario(s) that could directly result in sympatric speciation. Check all that apply.
_____ Two sunflower species cross to form a healthy hybrid individual with equal copies of chromosomes from each parental species. _____ A new river channel divides a population of beetles into two populations. _____ A large fence blocks the intermingling of two populations of a species. _____ A subset of flies within a larger population colonizes a new host plant. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about sympatric and allopatric speciation? 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?
RecA is not the only protein that can promote branch migration. One example is called RuvAB. RuvAB:
A. can promote branch migration but the process is very slow. B. contains two donut-shaped RuvA hexamers, related in structure to DnaB helicase, that have nuclease activity. C. cleaves the Holliday intermediate by replacing one RuvA with RuvC. D. can reload DnaB helicase to reprime DNA replication after repair. E. does not require ATP hydrolysis.
Which of the following environmental factors makes microbial populations resistant to antimicrobial agents?
A) Ability to form a biofilm B) Acidic conditions C) Presence of organic matter D) All of the above
The emergence of our ancestors' use of fire occurs around 1.8 million years ago
a. true b. false