This set of Cell Biology Multiple Choice Questions & Answers (MCQs) focuses on “Gene Expression Control – Eukaryotes”.
1. The sheep Dolly was cloned in the year ___________
a) 1997
b) 1999
c) 2000
d) 2002
View Answer
Explanation: A team of Scottish researchers reported the cloning of a mammal in 1997, a lamb which they names as Dolly. This was the first cloned mammal ever reported.
2. Single cells from an adult animal can give rise to whole new individuals.
a) True
b) False
View Answer
Explanation: Single cells from an adult animal cannot give rise to whole new individuals however, nuclei from such cells possess all the information necessary for developing a new organism.
3. How many types of cells were fused in the cloning of Dolly?
a) 2
b) 5
c) 7
d) 8
View Answer
Explanation: Two types of cells from different sheep were taken and fused with the aid of an electrical impulse in the cloning of Dolly. Enucleated unfertilized eggs from one sheep and cultured epithelial cells from udder of an adult sheep were fused together.
4. The transcriptional state of a cell is irreversible.
a) True
b) False
View Answer
Explanation: The transcriptional state of a cell depends on its chromatin, and is not irreversible. It rather depends on the environment which induces the types of genes that need to expressed.
5. The processing-level control is concerned with ____________
a) primary transcripts
b) secondary transcripts
c) tertiary transcripts
d) quaternary transcripts
View Answer
Explanation: The processing-level control is associated with primary transcripts and involves the processing of primary messenger RNAs in the nucleus before they begin with the translation in the cytoplasm.
6. What percent of a typical Red blood cell is constituted by hemoglobin?
a) 30
b) 50
c) 75
d) 95
View Answer
Explanation: Red Blood cell’s primary function is to carry oxygen. 95% of the RBC’s dry weight is made up of haemoglobin. Rest of the weight included the DNA, organelles and lipid membranes.
7. Which type of control determines for how long will a particular mRNA be translated?
a) Replication-level
b) Translational-level
c) Transcriptional-level
d) Processing-level
View Answer
Explanation: Translational-level control determines for how long a period, and how often a particular messenger RNA molecule is translated. The translational-level control is prevalent in the cytoplasm.
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