Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 1940
TLS Online TPP Program

#Question id: 1965

In some insects, such as Drosophila, fungal cell wall elements can activate the protein Toll. What is Tollʹs function?

#Unit 4. Cell Communication and Cell Signaling

  1. acts as a receptor that, when activated, signals synthesis of antimicrobial peptides

  2. functions directly to attack the fungi presented to it

  3. produces antimicrobial peptides by interaction with chitin

  4. secretes special recognition signal molecules that identifies specific pathogens

More Questions
TLS Online TPP Program

#Question id: 15249

#Unit 2. Cellular Organization

Halophiles have adapted so completely to ____________ conditions that they require high levels of ___________ to grow.
TLS Online TPP Program

#Question id: 18914

#Unit 13. Methods in Biology

In PBR322, If a DNA with SalI and BamHI will be selected on the basis of
TLS Online TPP Program

#Question id: 1664

#Unit 4. Cell Communication and Cell Signaling

A given Ig isotype is:
TLS Online TPP Program

#Question id: 694

#Unit 1. Molecules and their Interaction Relevant to Biology

Thr and/or Leu residues tend to disrupt an alpha helix when they occur next to each other in a protein because:
TLS Online TPP Program

#Question id: 3981

#Unit 3. Fundamental Processes

The diagram below represents a hypothetical operon in the bacterium E. coli.  The operon consists of two structural genes (A and B), which code for the enzymes A-ase and B-ase, respectively, and also includes P (promoter) and O (operator) regions as shown.

 When a certain compound (X) is added to the growth medium of E. coli, the separate enzymes A-ase and B-ase are both synthesized at a 50-fold higher rate than in the absence of X.  (X has a molecular weight of about 200.)  Which of the following statements is true of the operon decribed above?