The photoreceptor protein rhodopsin
A) is found in cone cells and is sensitive to weak light at many wavelengths.
B) is found in rod cells and is sensitive to weak light at many wavelengths.
C) is found in cone cells and is responsible for blue color vision.
D) is found in rod cells and is responsible for red color vision.
E) is missing in individuals who exhibit red-green color blindness.
B) is found in rod cells and is sensitive to weak light at many wavelengths.
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Transcription _____
a. uses both strands of DNA as templates b. uses the enzyme DNA polymerase c. results in a double-stranded end product d. produces three different types of RNA molecules e. does not require the hydrogen bonds of DNA to be broken
Newborn humans face thermoregulatory challenges as do small mammals. One mechanism they use to generate heat is
A. nonshivering thermogenesis in "brown fat." B. evaporation in "brown fat." C. radiation in "brown fat." D. convection in "brown fat." E. shivering thermogenesis in "brown fat."
In a marine ecosystem with an inverted biomass pyramid, which trophic level should have the smallest number of organisms?
A. zooplankton B. phytoplankton C. secondary carnivores (tuna) D. primary carnivores (sardines) E. detritivores
Which of the following is not true about the interaction of biofilms on teeth?
A) Brushing teeth twice daily and flossing will physically remove superficial plaque layers. B) Bacterial growth within deeper biofilm layers and new bacteria entering the mouth quickly reestablish what was removed from brushing. C) Limiting dietary fats reduces lactic acid production by the bacteria in dental plaque and decreases the risk for dental caries, D) When plaque calcifies into tartar it must be scraped off the teeth. E) Dentists recommend a twice-yearly dental cleaning and checkup to limit caries and periodontal disease,