Compare and contrast DNMT1, DNMT3a, and DNMT3b in regards to what they do, when they act, and how they affect gene transcription
What will be an ideal response?
DNMT1, DNMT3a, and DNMT3b are DNA methyltransferases and all add methyl groups to cytosines that are typically adjacent to guanines (CG). Promoters that get methylated will usually decrease gene expression. DNMT1 is primarily responsible for maintaining methylation patterns as DNA is being replicated and DNMT3a and DNMT3b are responsible for establishing the original methylation patterns.
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A controlled experiment is one that _____
A) proceeds slowly enough that a scientist can make careful records of the results B) tests experimental and control groups in parallel C) is repeated many times to make sure the results are accurate D) controls all variables E) is supervised by an experienced scientist
Coupled reactions are reactions in which an
A. exergonic reaction drives a spontaneous reaction. B. exergonic or endergonic reaction provides products not used for other reactions. C. exergonic reaction drives an endergonic reaction. D. endergonic reaction drives a spontaneous reaction. E. endergonic reaction drives an exergonic reaction.
The smallest unit of an element that still retains the chemical and physical properties of that element is called a(n)
A. molecular bond. B. isotope. C. nucleus. D. neutrino. E. atom.
Which of the following types of evidence is considered the most accurate in classifying organisms, according to the majority of scientists?
A.) Physiological B.) Molecular C.) Linnaean D.) Anatomical