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TLS Online TPP Program

#Question id: 7142

Keeping in mind the fact that genes are often named for the phenotype of a mutation in that gene, what might be the phenotype of a mutation of the Distal-less gene of Drosophila?

#Unit 5. Developmental Biology
  1. Mutations of distal-less would fail to pattern the wing veins along their antero-posterior axis
  2. Distal-less mutants would form only distal structures, like the tarsus (distal end) of the legs without a coxa (proximal end).
  3. Distal-less mutants would form only proximal structures, like the coxa (proximal end) of the legs without a tarsus (distal end).

  4. Distal-less mutants would fail to form the signaling center that controls dorso-ventral patterning.

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TLS Online TPP Program

#Question id: 2155

#Unit 2. Cellular Organization

Cholesterol is

a. unrelated to any plant lipids.                     

b. not found in chloroplast membranes.

c. encoded by an intron-containing gene on chromosome 23.

d. relatively abundant in the plasma membrane and endocytic membranes.

e. synthesized in the ER.
TLS Online TPP Program

#Question id: 2156

#Unit 2. Cellular Organization

Proteins known to be involved in Golgi apparatus independent transport of lipids include

a. StAR protein.                                 

b. Neimann-Pick C1 (NPC1) protein.

c. HMG CoA reductase.                    

d. acyl:cholesterol acyl transferase (ACAT).

e. cholesterol 7α-hydroxylase.  
TLS Online TPP Program

#Question id: 2157

#Unit 2. Cellular Organization

Which of the following is not a metabolic derivative of cholesterol?

a. dolichol                  

b. vitamin D               

c. bile acids    

d. v-SNARE molecules                     

e. NSF
TLS Online TPP Program

#Question id: 2158

#Unit 2. Cellular Organization

Which of the following factors increase(s) the rate of simple (passive) diffusion of a solute across a phospholipid bilayer?
TLS Online TPP Program

#Question id: 2159

#Unit 2. Cellular Organization

A channel protein
TLS Online TPP Program

#Question id: 2160

#Unit 2. Cellular Organization

An artificial membrane composed only of phospholipids has significant permeability to