TLS Online TPP Program

#Question id: 1978


In which of the following situations will helper T cells be activated?

#Unit 4. Cell Communication and Cell Signaling
  1. when an antigen is displayed by a dendritic cell

  2. when a cytotoxic T cell releases cytokines

  3. when natural killer (NK) cells come in contact with a tumor cell

  4. in the bone marrow during the self-tolerance test

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TLS Online TPP Program

#Question id: 11912

#Unit 10. Ecological Principles

The success of birds introduced to Tahiti or the Hawaiian Islands was dependent on the morphology of the species already present. If there was a small morphological difference in bill length between the resident and introduced species, then

TLS Online TPP Program

#Question id: 752

#Unit 1. Molecules and their Interaction Relevant to Biology

The A260/A280 ratio of a double-stranded DNA sample can be used to assess its purity. The value for the pure DNA is ----------------

TLS Online TPP Program

#Question id: 7216

#Unit 5. Developmental Biology

Following statements are about Specification of cell fate by the Dorsal protein. Which of the following statement is correct?

TLS Online TPP Program

#Question id: 11921

#Unit 10. Ecological Principles

Which of the following would be considered to be a natural population in a pond? 

TLS Online TPP Program

#Question id: 873

#Unit 1. Molecules and their Interaction Relevant to Biology

Intrinsically disordered proteins have properties that are distinct from classical structured proteins

A. Are characterized by sequences rich in certain polar and charged amino acids (Gln, Ser, Pro, Glu, Lys, Gly, and Ala)

B. Ordered proteins tend to participate in signaling and regulation, whereas Intrinsically disordered proteins are involved largely in catalytic reactions, transport processes, and structural functions.

C. Nearly half of all prokaryotic proteins contain long disordered segments, whereas only a few percent of eukaryotic proteins do.

D. Often adopt a specific secondary or tertiary structure when they bind to other molecules such as ions, organic molecules, proteins, and nucleic acids.