Which of the following statements is WRONG

11 Jun Which of the following statements is WRONG

Question
1. Which of the following statements is WRONG ?

a) Mitochondrial function is constant throughout a person’s lifetime.

b) A single eukaryotic cell may contain thousands of copies of the mitochondrial genome.

c) The mutation rate of mitochondrial DNA is higher than the mutation rate of nuclear DNA.

d) Both mitochondria and chloroplasts contain DNA.

2. A gene-encoding sequence is an example of which type of DNA sequence in eukaryotes?

a) Moderately repetitive DNA

b) Long interspersed elements

c) Short interspersed elements

d)Unique-sequence DNA

e)Highly repetitive DNA

3. How many different types of histones are found in the nucleosome that packages nuclear DNA? And how many pack mitochondrial DNA?

a) 5 ; 0

b) 5 ; 5

c) 1 ; 1

d) 2 ; 2

e) 0; 5

4. Which of the following best describes the concept of alternative splicing?

a) All eukaryotic genes are processed by alternative splicing.

b) All nucleotides in exons of a eukaryotic gene correspond to amino acids in the coded protein.

c) Every nucleotide contained in a mature mRNA molecule is derived from exon sequences.

d) All introns are removed from a pre-mRNA molecule to generate a functional mRNA transcript.

e) Multiple protein products can often be produced from a single eukaryotic gene.

5. Which of the following statements are TRUE regarding transcription in most organisms?

a) The DNA nontemplate strand is the one translated into proteins.

b) The DNA template strand is used to encode double stranded RNA.

c) Both DNA strands are transcribed for a single gene.

d) Different genes may be transcribed from different strands of DNA.

e) All genes are transcribed from the same strand of DNA.

6. In eukaryotes, which RNA polymerase transcribes the genes that encode proteins?

a) RNA polymerase III

b) RNA polymerase II

c) RNA polymerase V

d) RNA polymerase IV

e) RNA polymerase I

7. The TATA-binding protein (TBP) binds to the TATA box sequence in eukaryotic promoters. What is its function in transcriptional initiation?

a) It blocks access of RNA polymerase to the promoter, until removed by general transcription factors.

b) It is the subunit of prokaryotic RNA polymerase that is required to recognize poly-adenylation signals.

c) It modifies histones so that they can be removed from DNA for transcription.

d) It creates a phosphodiester bond between the nucleotides.

e) It bends and partly unwinds DNA at a promoter.

Question 12

Which one of the following statements regarding eukaryotic transcription is FALSE ?

a) There are several different types of RNA polymerase.

b) There is no one generic promoter.

c) Protein-coding genes are transcribed into polycistronic mRNAs.

d) Eukaryotic transcription involves a core promoter and a regulatory promoter.

e) Chromatin remodeling is necessary before certain genes are transcribed.

Question 14

In a transcription reaction, two phosphate groups are cleaved from the incoming

a) deoxyribonucleoside triphosphate.

b) ribozyme.

C) ribonucleoside triphosphate.

d) deoxyribonucleoside diphosphate.

e) ribonucleoside diphosphate.

Question 15

The 5? and 3? untranslated regions (UTRs) of processed mRNA molecules are derived from

a) protein-coding region.

b) introns.

c) promoter.

d) terminator.

e) exons.