________ bind two or more ions or molecules and transport them in opposite directions across a membrane.
A. uniporters
B. symporters
C. antiporters
D. dual transporters
E. channel pumps
C. antiporters
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One way to examine the assembly and organization of the actin cytoskeleton in animals is to examine
____.
a. animal cells in culture b. extracellular actin movement in bacterial pathogens c. intracellular actin movement in bacterial pathogens d. extracellular actin movement in viral pathogens e. intracellular actin movement in viral pathogens
What are the two most important variables for cells to survive?
a. Temperature and pH b. Temperature and solute concentration c. Solute concentration and nutrient levels d. Solute concentration and pH e. Temperature and nutrient levels
Which of the following is an advantage of
having a four-chambered heart?
a. only oxygen-rich blood flows to tissues b. blood pressure in the separate circuits is not independently controlled c. two separate circuits are possible d. only with a four-chambered heart are lungs possible e. more than one of these is an advantage to having a four-chambered heart
Compared to mammals and reptiles, what characteristic prevents amphibians from surviving far from water?
A) Their limbs are too weak to support their weight on land. B) They do not have any lungs and cannot breathe out of the water. C) Their eggs do not have an amnion which prevents them from drying out. D) Their cartilaginous endoskeleton would dry out on land.