Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 957
TLS Online TPP Program

#Question id: 975

What is the source of the C-6 atom during de novo biosynthesis of purines?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. carbon dioxide  

  2. tetrahydrofolate

  3. carbamoyl phosphate  

  4. glycine

More Questions
TLS Online TPP Program

#Question id: 4029

#Unit 3. Fundamental Processes

The TATA box
TLS Online TPP Program

#Question id: 12924

#Unit 13. Methods in Biology

In order to quantify unknown DNA templates, a standard dilution is prepared using DNA of known concentration. As the DNA accumulates during the early exponential phase of the reaction,an arbitrary point is taken where each of the diluted DNA samples cross. This is termed as_____
TLS Online TPP Program

#Question id: 19272

#Unit 9. Diversity of Life Forms

The seed coat’s most important function is to provide 
TLS Online TPP Program

#Question id: 68

#Unit 1. Molecules and their Interaction Relevant to Biology

Match the following functional groups given in column I with their respective representatives given in column II.

COLUMN I               COLUMN II

1. Anhydride               a. RCOOR

2. Ether                       b. ROCOCH3

3. Acetyl                     c. ROR

4. Amido                     d. RCOOCOR

5. Ester                        e. RCONH2
TLS Online TPP Program

#Question id: 4274

#Unit 3. Fundamental Processes

One mechanism that contributes to the fidelity of codon recognition involves the 16S rRNA other than initiation. Which of the following statements are correct in this phenomenon?

A. Codon recognition involves two adjacent uracil residues in the 16S rRNA component

B. The adjacent residues in the 16S rRNA do not discriminate between G:C or A:U base pairs and recognize either as correct

C. Even a single mismatch in the codon–anticodon base pairing alters the position of EF-Tu, reducing its ability to interact with the factor-binding center 16s rRNA, leads to a dramatic reduction in EF-Tu GTPase activity

D. Pyrophasphatic editing is key mechanism to ensure fidelity