Question

Part 8

Choose all that apply. The ability to perform differential gene expression is essential to cells because; (hint: three correct choices)

A. all cells can do same functions
B. cells can express genes only when they are needed
C. cells in the same organisms can do different functions
D. cells in the same organism can contain different genes
E. cells can utilize space and resources better

What is the function of the terminator?

• A. stops metastasis of cancers

• B. stops transcription of a gene

• C. stops DNA replication

• D. stops protein synthesis

By definition, a mutation is;

• A. change in a cell cycle controlling protein

• B. replacement of a nucleotide with another

• C. a permanent change in normal DNA sequence

• D. always a harmful event in a cell

What is the function of rRNAs in protein synthesis?

• A. bring the message from the gene to make proteins

• B. makeup the structure of the ribosome

• C. choose the correct amino acid to be added to the chain

• D. bring amino acids to be added to a growing protein chain

Answer 1

Differential gene expression is part of multi organ organism as even though the genome of the organism is same in every somatic cell they perform different functions, utilises resources which are immediate to them (Think of liver which can metabolise drugs while other organs can not) and they can switch them on and off as required.

So the right options are option B, C and E.

Question 2 :- Role of terminator

Terminator are sequences which are involved in the transcription of genes. They give signal to RNA polymerase to stop transcribing a gene. In translation, it is called Stop codon, so translation will not be the answer.

So the right option is Option (B) Stop transcription of genes.

Question 3:-

Mutation refers to when there's a change in the sequence of DNA in an organism genome. In mutation, one Nucleotide is replaced by the other nucleotide which may or may not result in a different polypeptide synthesis.

So the right option is Option (B) Replacement of a nucleotide with other

Question 4 :-

rRNAs plays a very pivotal and diverse role in protein synthesis. Protein synthesis is done by Ribosome and tRNA. Ribosome is made up of rRNAs.

While tRNA are responsible for codon recognition as well as bringing amino acids to the Ribosomes where protein synthesis is taking place.

So the right option is Option (B) Make up the structure of rRNA