This set of Plant Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Regulation of Gene Expression”.
1. Which of the following inhibits gene expression in plants?
a) siRNA molecules
b) Myriad transcription factors
c) Transcriptional regulators
d) RNA polymerases
View Answer
Explanation: Several regulatory molecules are involved in mediating gene expression in plants. These include myriad transcription factors, transcriptional regulators, RNA polymerases, translational proteins etc. siRNA molecules are also employed in gene expression process but they act as an inhibitor.
2. Transposons are DNA sequences that takes a fixed position in the genome.
a) True
b) False
View Answer
Explanation: The given statement is incorrect. Transposons are DNA sequences that does not have a fixed position in the genome. These sequences can sometimes cause or reverse mutation and are also involved in altering the cell’s genetic identity.
3. What is the full form of HAT with respect to gene expression?
a) Histamine transferases
b) Histone acetyltransferases
c) Histone acetylation
d) Histocompatibility factor
View Answer
Explanation: The full form of HAT is Histone acetyltransferases. HAT is a class of enzyme that are involved in dissociating the DNA from the histone complex, a process called histone deacetylation. This allows transcription to takes place.
4. Which of the following is true regarding microRNA?
a) They regulate gene expression post-translationally
b) They are Short coding RNA molecules
c) They express protein production
d) They silence gene expression
View Answer
Explanation: MicroRNAs are short non-coding RNA molecules that are involved in regulating gene expression post-transcriptionally, as a result they also silence gene expression. Additionally, MiRNAs repress protein production in eukaryotes by binding to the 3′ untranslated regions of target mRNAs.
5. RNA interference is also known as Post-Transcriptional Gene Silencing.
a) True
b) False
View Answer
Explanation: The given statement is correct. RNA interference is also known as Post-Transcriptional Gene Silencing. This process regulates the expression of protein-coding genes. RNA interference or RNAi can also be termed as co-suppression or quelling.
6. Which of the following statement is true regarding gene silencing?
a) Gene silencing occurs only during transcription
b) Gene silencing occurs only during translation
c) It suppresses the expression of a particular gene
d) It occurs only during post translational process
View Answer
Explanation: Gene silencing is an important gene regulatory mechanism which suppresses the expression of a specific gene. The process of gene silencing can not only occur in transcription but also occur during the course of translation.
Sanfoundry Global Education & Learning Series – Plant Biotechnology.
To practice all areas of Plant Biotechnology, here is complete set of 1000+ Multiple Choice Questions and Answers.
