1. Organisms likely use visible light because a. a large proportion of the elect
ID: 97635 • Letter: 1
Question
1. Organisms likely use visible light because
a. a large proportion of the electromagnetic radiation on Earth is light.
b. radiation with a higher energy than light might damage biological molecules more easily.
c. radiation with a lower energy content than light might not have enough energy to excite electrons.
d. radiation with longer wavelengths than light are absorbed by water and carbon dioxide.
e. all of the above
2. Which of the following statements is NOT correct?
a. DNA can be damaged by ultraviolet radiation.
b. The pigment melanin protects plants from excessive damage to their photosynthetic apparatus.
c. Shorter wavelengths of radiation are more harmful to organisms than longer wavelengths.
d. Human skin cells can be harmed by ultraviolet radiation.
e. Visible light contains less energy than ultraviolet radiation.
3. Photoheterotrophs
a. use light as an energy source.
b. are found in protists.
c. use carbon dioxide as a carbon source.
d. are found in certain groups of plants.
e. are NOT found in prokaryotes.
4. Chemoautotrophs
a. use organic or inorganic substances as an energy source.
b. are found in protists.
c. use organic substances as a carbon source.
d. are found in certain groups of plants.
e. are not found in prokaryotes.
Explanation / Answer
Answer:
1). e. All of the above
2). b. The pigment melanin protects plants from excessive damage to their photosynthetic apparatus.
Explanation:
Melanin molecules absorb and dissipate (as heat) 99.9% of the UV radiation falling on them, and therefore help protect the exposed outer parts of plants and animals from UV damage.
3. a. use light as an energy source.
Explanation:
Photo means light & trophs means organism.
4. a. use organic or inorganic substances as an energy source.
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