Question 1 - Answer these giving explanations Which of the following is untrue r

Question

Question 1 - Answer these giving explanations Which of the following is untrue regarding histone 3? A) It is positively charged B) It binds DNA. C) It carries epigenetic modifications. D) It is highly divergent across species. E) It is present in two copies in each nucleosome Small RNA molecules that function as adaptors between amino acids and the codons in mRNA during translation are known as: A) tRNA B) mRNA C) rRNA D) SRNA E) pRNA Short 21 nucleotide single-stranded RNAs that are cleaved from small hairpin-shaped precursors and block the e mRNAs by either causing their degradation or repressing their translation are known as: A) tRNA B) miRNA C) rRNA D) snRNA E) pRNA of complementary or partially complementary RNA polymerase binds to a specific nucleotide sequence near the start of transcription known as a/an: A) Operator B) Promoter C) Enhancer D) Silencer E) Origin of replication Which of the following statements is correct about E. coli promoters? A) Most promoters have a high degree of sequence similarity B) 10 and-35 regions show the most conservation between promoters. C) The GC-rich-10 region facilitates the localized unwinding of DNA D) Distance between the-10 and-35 regions is moderately conserved from 10 to 30 nucleotides in length E) CAP binds to the-10 region of the promoter The sigma subunit initially recognizes and binds to which of the following sequences? A) -10 B) 35 D) +10 E) +35

Explanation / Answer

1. D. it is highly divergent across species

Histone H3 is conserved across eukaryotic genomes.

2. A. tRNA

tRNA act as adaptors as they can bind to both the codons and to the amino acids.

3. B. miRNA

microRNA or miRNA are named because of their small size.

4. B. promoter

binding of RNA polymerase to promoter leads to start of transcription

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