MULTIPLE CHOICE I am double checking my answers to an assignment that I am submi

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MULTIPLE CHOICE

I am double checking my answers to an assignment that I am submitting and I do not require explanations. Thank you for your help you guys!

2.     Pigment molecules absorb light because

a.      they have a conjugated system of single and double carbon bonds.

b.     they have a highly complex chemical structure.

c.      they have several ring systems.

d.     they are able to reflect photons back and forth.

e.      their molecules have a characteristic size and shape.

3.     The 9+2 structure refers to

a.      the arrangement of microfilaments in prokaryotes.

b.     the arrangement of microfilaments in eukaryotes.

c.      the arrangement of microtubules in the flagella of eukaryotes.

d.     microfilaments in a cross-section of prokaryote flagella.

e.      the intermediate filaments in eukaryotes.

3.     Chemoheterotrophs

a.      use light as an energy source and organic matter as a carbon source.

b.     use light as an energy source and CO2 as a carbon source.

c.      oxidize substances to gain energy, and use CO2 as a carbon source.

d.     oxidize substances to gain energy, and use organic matter as a carbon source.

e.      none of the above

4.     All of the following are functions of the cell membrane EXCEPT

a.      transmitting signals.

b.      participating in energy transfer.

c.      being freely permeable to all substances.

d.     regulating the passage of materials.

e.      participating in chemical reactions.

5.     Active membrane transport involves

a.      NADH.

b.     diffusion.

c.      movement against a concentration gradient.

d.     exocytosis.

e.      all of the above.

2.     Which of the following terms relates to phagocytosis?

a.      endocytosis

b.      exocytosis

c.      pinocytosis

d.     cell drinking

e.      all of the above

Explanation / Answer

2.all options are correct.

3.option D is correct.

4.membrane is not freely permeable to all substances so option C is wrong.

5. Option C is correct answer, because movement against concentration gradient is active transport.

6.all of the above indicates phagocytosis , so option E correct

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