TLS Online TPP Program

#Question id: 12967


Which of the following is the best explanation for why net primary productivity in terrestrial ecosystems tends to increase toward the tropics?

#Unit 10. Ecological Principles
  1. The higher species diversity in the tropics tends to increase plant growth. 
  2. There are lower metabolic costs to plant growth in the tropics.
  3. The availability of water and warm temperatures in the tropics fosters photosynthesis.
  4. The tropics have more predators that minimize herbivory.
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TLS Online TPP Program

#Question id: 2447

#Unit 2. Cellular Organization

In the axonemes, the arrangement of nine outer doublet microtubules, as well as the protofilament number of each outer doublet, is specified by

TLS Online TPP Program

#Question id: 2448

#Unit 2. Cellular Organization

Axonemal dynein

a. may contain two or three head domains.

b. attaches to a B tubule through its base domain.

c. consists of heavy, intermediate and light chains.

d. is a (-) end-directed motor.            

e. is an ATPase.

TLS Online TPP Program

#Question id: 2449

#Unit 2. Cellular Organization

What is the correct order of the stages of mitosis?

a. anaphase               

 b. metaphase              

c. telophase    

d. prophase                 

e. prometaphase

TLS Online TPP Program

#Question id: 2450

#Unit 2. Cellular Organization

Which of the following contribute(s) to pole separation during anaphase B?

a. cytosolic dynein     

b. a (-) end-directed kinesin               

c. CENP-E                     

d. microtubule depolymerisation                   

e. microtubule polymerization

TLS Online TPP Program

#Question id: 2451

#Unit 2. Cellular Organization

The average lifetime of microtubules during mitosis is

TLS Online TPP Program

#Question id: 2452

#Unit 2. Cellular Organization

Intermediate filaments

a. are typically 6 nm in diameter.                  

b. are essential for cell motility.

c. may be used to diagnose the tissue of origin for many cancers.

d. are composed of globular subunits.                       

e. are formed from tetrameric subunits.