List of top Plant Sciences Questions on Gene expression asked in ICAR AIEEA (PG)

Match List-I with List-II
List-I (Operon component):
(A). Promoter
(B). Operator
(C). Structural gene
(D). Regulatory gene
List-II (Role):
(I). Produces repressor protein
(II). Site where repressor binds
(III). Code for functional proteins
(IV). Binding site for RNA polymerase

Who proposed 'Operon' model for gene regulation in bacteria?

In the case of Lac operon, the presence of glucose in the cell/growing media will lead to

The process of 'turning on the expression of genes' due to environmental conditions is called

The DNA sequence located upstream to a gene sequence where DNA polymerase binds is known as

Given below are two statements:
Statement (I): An epigenetic change is an alteration in gene expression associated with alternative chromatin or methylation state without any change in the DNA sequence.
Statement (II): The alternative epigenetic states are not heritable either through mitosis or meiosis.
In light of the above statements, choose the most appropriate answer from the options given below:

During the expression of a gene in a eukaryotic organism, a series of events happen one after another. Arrange the following steps of gene expression in eukaryotes chronologically i.e. from the first to the last-
(A). Movement of the matured mRNA from the nucleus to the cytoplasm
(B). Formation of transcript (pre-mRNA) in the nucleus
(C). Removal of the introns, joining the exons, and addition of 5'cap and poly-A tail to the pre-mRNA
(D). Attachment of the mRNA with the Ribosome for translation in the cytoplasm
Choose the correct answer from the options given below:

The activities happening during RNA editing are:
(A). A change in RNA base sequence after transcription
(B). Usual addition or occasional deletion of 'U' residues
(C). Occasional addition of 'C' residues
(D). Proceeding with the editing in the 5'-3' direction of mRNA
Choose the correct answer from the options given below:

Which of the following describes a 'gene' correctly?
(A). Genes are located on chromosome
(B). Gene is a discrete particle
(C). Recombination can happen within a gene
(D). One gene can encode more than one polypeptide
Choose the correct answer from the options given below:

The 'One gene-one enzyme' hypothesis was challenged by several researchers for its validity. The reasons are-
(A). Many enzymes are composed of more than one polypeptide encoded by different genes.
(B). Product of many genes are not enzymes
(C). Genes contain introns, which do not codes for any amino acids
(D). Several related polypeptides can be obtained from a single gene through alternate splicing
Choose the correct answer from the options given below:

'Genetic imprinting', a process of gene silencing, is postulated to be caused by-

Which of the following is true about the start codon in the genetic code dictionary ?

The concept of genes is not static but dynamic. Arrange the changing concept of genes chronologically - from earliest to the latest
(A) Gene is a sequence of nucleotides encoding functional products
(B) Isolation of nuclein by Friedrich Miescher
(C) One gene-one metabolic pathway block
(D) One gene-one polypeptide
Choose the correct answer from the options given below:

A female Drosophila contains two XX chromosomes while a male Drosophila contains only one X chromosome. However, the amounts of enzymes or even RNA produced by the X-linked genes in the females are equal to those in the males. The reasons are -
(A) The translation machinery in the female is not as efficient as that in the male Drosophila
(B) The X-linked genes in the female Drosophila are highly regulated to make a balance in the expression of genes between males and females
(C) One X-chromosome in the female Drosophila is inactivated
(D) The Y-chromosome in the male Drosophila acts as an X-chromosome to make a balance in product development.
Choose the correct answer from the options given below :

A nonsense mutation involves the creation of a an -

The genetic codes are degenerative in nature. The degeneracy is observed primarily in the-

Members of which of the nitrogen fixing genera form symbiotic associations with aquatic fern {Azolla

Given below are two statements
Statement I: Plastids are site of purine synthesis.
Statement II: Cytosol is the site of pyrimidine synthesis.
In light of the above statements, choose the most appropriate answer from the options given below

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A : Magnetic separator in seed processing unit separate the seeds based on seed surface texture and stickiness of the seeds
Reason R : Insect-damaged and partially filled seeds may appear to be same as the normal seeds in shape and size, but it varies in their specific gravity.
In light of the above statements, choose the correct answer from the options given below

In Q-banding experiments, the light fluorescent band indicates that the chromosomal region is rich in base pairs-

Toxic shock syndrome, a severe infection characterized by high fever and vomiting is caused by