Methylation and RNA interference are both involved in regulating mobile genetic elements. Which of the following statements is TRUE?
A) Methylation is a form of post-transcriptional silencing, whereas RNA interference is a form of pre-transcriptional silencing.
B) Both are examples of post-transcriptional silencing.
C) Both are examples of pre-transcriptional silencing.
D) RNA interference is a form of post-transcriptional silencing, whereas methylation is a form of pre-transcriptional silencing.
D
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When molecules are referred to as D- or L- (for example D-forms of sugars and L-forms of amino
acids), the D- and L- designations refer to the specific ____.
a. functional group b. structural isomer c. covalent bond d. secondary structure e. stereoisomer
A hedgehog has 90 chromosomes in their diploid cells. At the end of meiosis II how many chromosomes and sister chromatid are present in each daughter cell?
A. 45 Chromosomes, 0 Chromatids B. 90 Chromosomes, 90 Chromatids C. 45 Chromosomes, 45 Chromatids D. 90 Chromosomes, 0 Chromatids
In retroviruses, there is a stop codon at the end of the reading frame for the first gene
However, in about 5% of the proteins, the stop codon is bypassed, resulting in translation of the second gene and synthesis of a fused protein representing both genes 1 and 2. How is the stop codon bypassed if the reading frames of the first and second genes are different? What will be an ideal response?
Which strategies would a seawater fish with an internal osmolarity of 320mOsm/L living in a marine environment of 1010mOsm/L utilize to maintain internal ion and water homeostasis?
A. Produce copious amounts of dilute urine. B. Drink seawater and actively transport salts into their bodies at the gills. C. Drink seawater and actively excrete salts out of their bodies across the gills. D. Don't drink seawater and actively transport salts into their bodies at the kidneys. E. All of the choices for this question are correct.