Penguins, seals, and tuna have body forms that permit rapid swimming, because _____
A) all share a recent common ancestor
B) all of their bodies have been compressed since birth by intensive underwater pressures
C) the shape is a convergent evolutionary solution, which reduces drag while swimming
D) this is the only shape that will allow them to maintain a constant body temperature in water
C
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Where are most glucose transporter proteins ("GLUTs") located when levels of the hormone insulin are LOW?
A. inserted into the plasma membrane B. in the membranes of intracellular vesicles C. inserted into the nuclear membrane D. in the endoplasmic reticulum E. in the liver—They are transported to other cells when glucose levels rise.
Why is a digestive system with a single digestive opening inefficient?
What will be an ideal response?
True or false? Some protists have no nucleus
Indicate whether the statement is true or false
What happens to the ATP molecule after it has been used to do work?
A) It breaks down into carbon dioxide and water. B) It is split into two molecules of pyruvic acid. C) It loses a phosphate group and is converted to ADP. D) It is completely destroyed.