Mupltiple choice questions Thanks a lot for your help. I have completed my multi

Question

Mupltiple choice questions

Thanks a lot for your help. I have completed my multiple choice questions and want to double check my answers before submitting it. I don't really need an explanation for the questions.

1. Which of the following is true for photons?
a. They have a tiny mass but no energy.
b. They have no mass but a tiny amount of energy.
c. They have both a tiny mass and a tiny amount of energy.
d. They cannot interact with matter.
e. They are always reflected when they collide with matter.

2. Bioluminescence
a. is important for photosynthesis.
b. produces a large amount of heat.
c. usually involves chloroplasts.
d. occurs in some plants living in the deep seas.
e. occurs when an excited electron returns to its ground state.

3. 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.

4. 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.

Explanation / Answer

1. b. They have no mass but a tiny amount of energy. Photons have no mass. They have energy which depends on the wavelength. They can interact with matter. They are either absorbed, scattered, or reflected by the matter.

2.e. occurs when an excited electron returns to its ground state. When excited electrons lose energy, the difference in the energy is released as photons. The wavelength of the photon emitted depends on the energy that is lost, and this determines the color of the emitted light.

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