This set of Biology Multiple Choice Questions & Answers (MCQs) focuses on “Molecular Basis of Inheritance – Regulation of Gene Expression”.
1. In which of the following levels can gene expression not be exerted?
a) Transitional level
b) Transcriptional level
c) Reverse transcriptional level
d) Processing level
Explanation: In eukaryotes, the regulation of gene expression occurs at various levels. They are transcriptional level, processing level, transport of mRNA from the nucleus to the cytoplasm and translational level.
2. Which of the following products are produced when lactose is hydrolysed?
a) Glucose and Fructose
b) Glucose and Galactose
c) Two molecules of glucose
d) Fructose and Galactose
Explanation: Lactose is a disaccharide carbohydrate molecule. On hydrolysis of a disaccharide, we get 2 molecules of monosaccharides. Likewise, when we hydrolyse a single molecule of lactose, we get one molecule of glucose and galactose. On hydrolysis of Sucrose, we get glucose and fructose. On hydrolysis of Maltose, we get 2 molecules of glucose.
3. Regulatory protein can act both as an activator and a repressor.
Explanation: The regulatory proteins have the ability to act both as an activator and a repressor. They will be positive when they are activators. They will be negative when they are repressors.
Sanfoundry Global Education & Learning Series – Biology – Class 12.
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