Practice Questions

TLS Online TPP Program

#Question id: 4289

Match the Following

A. fidelity of codon recognition

1. involves two adjacent adenine residues in the 16S rRNA component located

within the A-site of the small subunit. These bases form hydrogen bonds with

the minor groove of each correct base pair formed between the anticodon and

the first two bases of the codon in the A-site

B. kinetic selectivity

2. 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. This, in turn, leads to a dramatic reduction in EF-Tu GTPase activity

C. Accommodation

3. When the charged tRNA is first introduced

into the A-site in a complex with EF-Tu-GTP, its 30 end is distant from the site of peptide-bond formation. To participate successfully in the peptidyl transferase reaction, the tRNA must rotate into the peptidyl transferase center of the large subunit in a process

#Unit 3. Fundamental Processes

A2, B3, C1
A1, B2, C3
A2, B1, C3
A1, B3, C2

More Questions

TLS Online TPP Program

#Question id: 1393

#Unit 4. Cell Communication and Cell Signaling

In research on aging (both cellular aging and organismal aging), it has been found that aged cells do not progress through the cell cycle as they had previously. Which of the following, if found in cells or organisms as they age, would provide evidence that this is related to cell signalling?

TLS Online TPP Program

#Question id: 1394

#Unit 4. Cell Communication and Cell Signaling

Apoptosis involves all but which of the following?

TLS Online TPP Program

#Question id: 1395

#Unit 4. Cell Communication and Cell Signaling

Which of the following mutations would promote malignancy in cells whose proliferation is inhibited by TGFβ?

a. overexpression of Smad2

b. loss of Smad 4

c. overexpression of TGFβ receptor I

d. loss of TGFβ receptor II