Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 315
TLS Online TPP Program

#Question id: 333

Which of the following feature of RNA adds to its propensity to form double-helical structure?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. Watson-Crick base pairing between A:U base pair which has hydrogen bonds between N6 of adenine and C4 of uracil, and between N1 of adenine and N3 of uracil.

  2. Non Watson-Crick base pairing between G:U base pair, which has hydrogen bonds between N3 of uracil and the C6 of guanine, and between the C2 of uracil and N1 of guanine.

  3. Non Watson-Crick base pairing between G:U base pair, which has hydrogen bonds between N3 of guanine and the C6 of uracil, and between the C2 of uracil and N1 of guanine.

  4. Watson-Crick base pairing between A:U base pair which has hydrogen bonds between N6 of uracil and C4 of adenine, and between N1 of adenine and N3 of uracil.

More Questions
TLS Online TPP Program

#Question id: 16955

#Unit 4. Cell Communication and Cell Signaling

Stage thymocytes express neither CD4 nor CD8, markers associated with mature T cells. They are therefore called double negative (DN) cells. DN cells first travel to the region under the thymic capsule, a region referred to as the ________, where they proliferate and begin to generate their T-cell receptors. Thymocytes that successfully express TCRs begin to express both CD4 and CD8, becoming double positive (DP) cells, and populate the cortex, the site where most (85% or more) immature T cells are found.
TLS Online TPP Program

#Question id: 16956

#Unit 4. Cell Communication and Cell Signaling

Polyclonal antibodies are raised against bovine serum albumin in rabbit. Subsequently IgG in the antiserum is purified and digested with either pepsin or papain. Out of the following possibilities, which one is correct?
TLS Online TPP Program

#Question id: 16957

#Unit 4. Cell Communication and Cell Signaling

the immune system can be summarized as follows. Which is not correct for immune system?
TLS Online TPP Program

#Question id: 16958

#Unit 4. Cell Communication and Cell Signaling

Plasmacytoma or myeloma tumors secrete large amounts of monoclonal antibodies into the serum and tissue fluids of the patients, and these antibodies can be purified in large quantities. Which statement is true for Bence-Jones proteins?
TLS Online TPP Program

#Question id: 16959

#Unit 4. Cell Communication and Cell Signaling

antigenic determinant is defined as a region of an antigen that makes contact with the antigen-combining region on an antibody. Which statement is true for Anti-isotype antibodies?
TLS Online TPP Program

#Question id: 16960

#Unit 4. Cell Communication and Cell Signaling

antigenic determinant is defined as a region of an antigen that makes contact with the antigen-combining region on an antibody. Which statement is true for allotypic determinants?