Molecular Basis of Inheritance - Online Test
Q1. Operon concept was given by
Answer : Option D
Explaination / Solution:
Jacob and Monod (1961) gave the concept of Operon model to explain the gene regulation in prokaryotes using simple experiments to grow E. coli in petriplates containing histidine, lactose or lactose and glucose in the medium.
Q2. What is called Griffith effect?
Answer : Option C
Explaination / Solution:
Griffith's experiment, was an experiment done in 1928 by Frederick Griffith. It was one of the first experiments showing that bacteria can get DNA through a process called transformation.
Griffith carried out experiment on mice using pneumonia causing bacteria to show that DNA is the genetic material by transforming non-virulent strain into virulent strain which is called bacterial transformation.
Q3. Enzymes called ______ add complementary nucleotides, floating inside the nucleus.
Answer : Option B
Explaination / Solution:
The DNA polymerases are enzymes that create DNA molecules by assembling nucleotides, the building blocks of DNA. These enzymes are essential to DNA replication and usually work in pairs to create two identical DNA strands from one original DNA molecule. It is found floating freely inside the nucleus.
Q4. Repressor proteins are coded by ______ genes.
Answer : Option D
Explaination / Solution:
Regulator genes codes for repressor proteins during translation of DNA into protein via mRNA.
Q5. RNA molecules that act as enzymes are called
Answer : Option C
Explaination / Solution:
Until about 20 years ago, all known enzymes were proteins. But then it was discovered that some RNA molecules can act as enzymes; that is, catalyze covalent changes in the structure of substrates (most of which are also RNA molecules). Catalytic RNA molecules are called ribozymes.
Only a few RNA molecules act as enzymes.
Q6. RNA polymerase is only capable of catalyzing the process of
Answer : Option B
Explaination / Solution:
During protein synthesis, elongation of peptide chain is catalyzed by the enzyme RNA polymerase. Elongation continuous until a non-sense or stop codon is reached.
Q7. Which one represents the correct manner of DNA replication?
Answer : Option A
Explaination / Solution:
During replication of DNA, in one strand (3’ to 5’) replication takes place continuously and in other strand it is in small segment and joined together by DNA ligase enzyme.
Q8. DNA sequence that code for protein are known as
Answer : Option D
Explaination / Solution:
Exons are coding sections of an RNA transcript, or the DNA encoding it, that are translated into protein. Exons can be separated by intervening sections of DNA that do not code for proteins, known as introns.
Q9. Signaling between cells usually results in the activation of protein
Answer : Option B
Explaination / Solution:
Signaling between cells for transcription of m-RNA from DNA is controlled by an activation of protein kinases. It is present in cytoplasm of cells.
Q10. A gene of operon which synthesizes a repressor protein is
Answer : Option C
Explaination / Solution:
No Explaination.
