biology mcqs
Test your comprehensive knowledge of DNA structure, replication, transcription, genetic code, translation, gene regulation, the Human Genome Project, and DNA fingerprinting with these challenging multiple-choice questions.
Showing questions 101 - 120 of 169
101. The genetic code is nearly universal. What is an example given for this universality?
102. Where have exceptions to the universality of the genetic code been found?
103. What are the dual functions of the AUG codon?
104. Which of the following are recognized as stop (terminator) codons?
105. A classical example of a point mutation resulting in sickle cell anemia involves a change of a single base pair in the gene for beta globin chain, leading to the change of which amino acid residue?
106. What type of mutation results when an insertion or deletion of one or two bases changes the reading frame from the point of insertion or deletion?
107. What is the effect of insertion or deletion of three or its multiple bases on the reading frame?
108. Who postulated the presence of an adapter molecule to read the genetic code and link it to amino acids?
109. What was the tRNA (previously called sRNA) assigned much later as its role?
110. What two key features does a tRNA molecule have?
111. Are tRNAs specific for each amino acid?
112. Are there tRNAs for stop codons?
113. The secondary structure of tRNA looks like what, and its actual structure looks like what?
114. What refers to the process of polymerisation of amino acids to form a polypeptide?
115. What is the bond joining amino acids in a polypeptide called, and does its formation require energy?
116. The process where amino acids are activated in the presence of ATP and linked to their cognate tRNA is called what?
117. What is the cellular factory responsible for synthesising proteins, and what does it consist of?
118. Which rRNA in bacteria acts as an enzyme (ribozyme) for the formation of peptide bonds?
119. What defines a translational unit in mRNA?
120. What are the additional sequences in mRNA that are not translated and are present at both 5'-end (before start codon) and at 3'-end (after stop codon) called?