Different modification of the histone have different effects on gene expression. For instance, the ninth amino acid of histone 3 is a lysine (H3K9 ) can be acetylated once or methylated up to three times. Which of the following is true regarding H3K9
modification?
A) If H3K9 is acetylated, then the gene will be repressed.
B) If H3K9 has a single methyl group, then the gene will be repressed.
C) If H3K9 has two methyl groups, then the gene will be activated.
D) If H3K9 has three methyl groups, it is maximally activated compared to only having one methyl group.
E) If H3K9 has three methyl groups, then the gene will be repressed.
Answer: E
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Which one of the following is nottrue of tRNA molecules?
A. tRNA molecules are single-stranded RNA. B. The 3'-terminal nucleotide of tRNA is the site of amino acid attachment. C. The anticodon arm of tRNA contains a three nucleotide sequence that is identical to a specific mRNA codon. D. tRNA molecules contain the unusual nucleotides dihydrouridine, pseudouridine, and ribothymine.
The ultimate goal of sexual reproduction is to produce genetic ________ in offspring and in the population
Fill in the blank(s) with the appropriate word(s).
Patients with Creutzfeldt-Jacob disease live ________ post diagnosis.
A. 10 to 20 years B. greater than 25 years C. 5 to 10 years D. less than 1 year E. 1 to 5 years
Norovirus is the leading cause of viral gastroenteritis in the United States.
Answer the following statement true (T) or false (F)