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TLS Online TPP Program

#Question id: 10230

Closely related species whose populations are sometimes allopatric showing greater morphology similarity but in a sympatric with distinct morphology due to

#Unit 10. Ecological Principles
  1. Sympatric populations, which would potentially intraspecific competition for resources, show differences in body structures and in the resources they use
  2. Sympatric populations may influenced to dissimilar environmental condition, differences in body structures and in the resources they use
  3. Sympatric populations, which would potentially compete for mate choice, show differences in body structures and in the resources they use
  4. Interspecific competition in this system could change the morphology of competing species of sympatric population
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TLS Online TPP Program

#Question id: 2440

#Unit 2. Cellular Organization

Microtubule assembly in vitro requires

a. ATP.                                                           

b. a threshold (critical) concentration of tubulin.

c. warming the solution to 37°C.                   

d. microtubule-associated proteins.         

e. GTP.
TLS Online TPP Program

#Question id: 2441

#Unit 2. Cellular Organization

Which of the following statement(s) is (are) true of microtubule assembly?

a. GDP-tubulin normally assembles into microtubules.

b. Microtubule (-) ends grow faster than microtubule (+) ends.

c. Tubulin subunits assemble to form a protofilament.

d. Microtubules consist of multiple protofilaments.

e. Microtubules with a GTP cap will shorten.
TLS Online TPP Program

#Question id: 2442

#Unit 2. Cellular Organization

The drug colchicine acts to

a. promote microtubule assembly.     

b. inhibit microtubule assembly.

c. sever microtubules.                        

d. block cell division.

e. cap microtubule ends.
TLS Online TPP Program

#Question id: 2443

#Unit 2. Cellular Organization

Microtubule-associated proteins

a. typically co-localize with microtubules inside cells.

b. are divided into two types: those that stabilize microtubules and those that destabilize microtubules.

c. typically co-purify with microtubules.                  

d. are similar to α- and β-tubulin.
TLS Online TPP Program

#Question id: 2444

#Unit 2. Cellular Organization

Kinesin I moves vesicles
TLS Online TPP Program

#Question id: 2445

#Unit 2. Cellular Organization

All members of the kinesin family of motor proteins