Where are calcium ions stored?
a. mitochondria
b. smooth endoplasmic reticulum
c. centrioles
d. rough endoplasmic reticulum
e. microtubules
b. smooth endoplasmic reticulum
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The skeletal elements that give support to a sponge's body are called
a. choanocytes. b. spongin. c. spicules. d. collar cells. e. porocytes.
Target tissues often have receptors for multiple hormones. The response of the target tissue depends on
a. blood levels of and interactions between the hormones that affect it. b. blood levels of the hormones that affect it. c. interactions between hormones. d. blood levels of and interactions between the hormones that affect it and the effects of other signaling molecules, such as prostaglandins. e. growth hormones levels.
The corkscrew-shaped bacterium ________ is vectored by ticks into humans and eventually may cause nervous system issues
A) Borrelia burgdorferi B) Yersinia pestis C) Clostridium botulium D) Escherichia coli E) Clostridium tetani
Potable water is water that
A) is considered safe to drink because it is completely sterile. B) contains biosensors. C) contains a dangerous number of microorganisms. D) is transferred from one place to another. E) contains low amounts of microorganisms and is considered safe to drink.