Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 11879
TLS Online TPP Program

#Question id: 1974

A person exposed to a new cold virus would not feel better for one to two weeks because

#Section 2: General Biology

  1. specific B cells and T cells must be selected prior to a protective response.

  2. it takes up to two weeks to stimulate immunologic memory cells.

  3. no memory cells can be called upon, so adequate response is slow.

  4. antigen receptors are not the same as for a flu virus to which she has previously been exposed.

More Questions
TLS Online TPP Program

#Question id: 18839

#Section 7: Recombinant DNA technology and Other Tools in Biotechnology

Two dimensional gel electrophoresis is a technique for separating proteins
TLS Online TPP Program

#Question id: 10550

#Section 6: Plant, Animal and Microbial Biotechnology

Plants, in turn, evolved a second line of defense that recognize these intracellular effectors and trigger defense responses to render them harmless. As a result, plants possess a second type of immunity called,
TLS Online TPP Program

#Question id: 15560

#Section 6: Plant, Animal and Microbial Biotechnology

Nearly all of the genetic improvements to industrially important antibiotic-producing strains have been achieved by the use of 
TLS Online TPP Program

#Question id: 14742

#Section 5: Bioprocess Engineering and Process Biotechnology

Gel chromatography is used for hormone separation. A pilot-plant scale gel chromatography column packed with sephacryl resin is used to separate two hormones, A and B. The column is 5 cm in diameter and 30 cm in height: V, = 1.9x 10-4m3, Wr = 3x10-3m3 /kg dry sephacryl, ps =1.25 x 103 kg/m3 . The partition coefficients are kpA =0.38 and kpB= 0.15. If the eluting flow rate is 0.7 I/h, what is the retention time for each hormone? 
TLS Online TPP Program

#Question id: 1639

#Section 2: General Biology

T-cell surface receptors for antigen partly recognize: