The bacteria that cause tooth decay have a capsule. What does this tell you about the relative effectiveness of a toothbrush with stiff bristles and one with soft bristles?
What will be an ideal response?
The capsule is a sticky outer coating found on some bacteria cells, including the ones that cause tooth decay. A soft-bristled brush may not be strong enough to remove the bacteria from the tooth enamel.
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A) receiving extracellular signals. B) amphipathic modification. C) temperature control. D) protein manufacture. E) information storage.
Birds are different from reptiles in all of the following features except
A. endothermy. B. their lack of teeth. C. the presence of feathers. D. the presence of a flight skeleton. E. bipedalism.
Mesophyll consist of _____
a. waxes and cutin c. photosynthetic cells b. lignified cell walls d. cork but not bark
The "cuddle hormone," secreted in greater quantities following sexual contact, is
a. testosterone. b. estrogen. c. follicle stimulating hormone. d. melatonin. e. oxytocin.