Carotenoids are important to many plants because these pigments are able to
A. remove carbon dioxide from the air.
B. absorb wavelengths of light that neither chlorophyll a nor b can absorb.
C. absorb water so that hydrolysis can be carried out in the chloroplasts.
D. capture UV radiation that is harmful to the DNA in the nucleus of plant cells.
E. store electrons for use during the "dark" reaction of photosynthesis.
B. absorb wavelengths of light that neither chlorophyll a nor b can absorb.
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Increased melatonin levels cause a decrease in
___ production.
a. aldosterone b. ADH c. testosterone d. insulin e. glucagon
Spinal nerves:a
contain only sensory neurons. b. contain only motor neurons. c. contain both sensory and motor neurons. d. form ganglia before they enter and exit the medulla. e. are part of the central nervous system.
Which property of water would help to account for how an individual who is exercising and producing excessive heat can maintain a constant body temperature?
a. Water has high heat capacity. b. Water is less dense than ice. c. Water is a good solvent. d. Water is cohesive. e. Water molecules form by covalent bonding.
Which of the following statements is TRUE of disinfectants?
A) They are effective in destroying endospores. B) They are used on living tissue. C) They are used for sterilization. D) They are used on inanimate surfaces. E) They are only effective for short periods of time (seconds to minutes).