Question

part 8

Which statement is TRUE about genes?

• A. promoter marks the end of a gene

• B. genes are located on chromosomes

• C. genes can function as enzymes

• D. all parts of a gene is copied RNA

One of the reasons why a cell would activate a gene only if its product is required, is;

• A. to prevent telomere shortening

• B. to minimize mutations

• C. for fast response

• D. to conserve energy

Most point mutations that could cause genetic disorders may originate during;

• A. transcription

• B. DNA replication

• C. telomerase activity

• D. translation

A primary mRNA (also known as pre-mRNA) contains;

• A. promoter

• B. 5' cap and 3' poly(A) tail

• C. exons and introns

• D. terminator

What do microRNAs do in relation to differential gene expression?

• A. reverse transcription of mRNAs

• B. transcription of mRNAs

• C. Splicing of mRNAs

• D. cutting or blocking mRNAs

According to the central dogma of molecular biology, the flow of information happens in the order;

• A. DNA → Exons → Splicing → Introns → Protein

• B. chromosome → gene → allele → mRNA → protein

• C. Protein → mRNA → DNA

• D. DNA → RNA → Protein

The copying of information in DNA onto an RNA is called as ________ , while the production of a protein using information on RNA is called as _________ .

• A. transcription, translation

• B. DNA replication, transcription

• C. translation, transcription

• D. DNA replication, translation

Answer 1

Ans)genes are located on chromosomes

Explanation: genes are present on chromosomes in a linear order.

Ans2) to conserve energy

Explanation:it save so much energy and space to turn on the expression of genes when required.

Ans3)dna replication

Explanation: point mutation involves commonly substitution of one base with another and originate during DNA replication.

Ans4) exon and intron

Explanation: primary mRNA consists of exon and intron while mature RNA consist of exon along with 5'cap and 3' polyA tail

Ans5) cutting or blocking mRNA

Explanation: mi RNA is small post transcriptional regulation RNA which cut mRNA to prevent translation

Ans6)DNA → RNA → Protein

Ans7) transcription ,translation