Base pairs in DNA are attracted to each other by
A. ionic bonds.
B. covalent bonds.
C. hydrogen bonds.
D. unzipping enzymes.
C. hydrogen bonds.
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Neurotransmitters are stored in vesicles located within axon terminals
Indicate whether the statement is true or false.
Which of the following would increase the electrochemical gradient across a membrane?
A) a sucrose-proton cotransporter B) a proton pump C) a potassium channel D) both a proton pump and a potassium channel
In general, the term ________________ is used to describe disease causing agents.
Fill in the blank(s) with the appropriate word(s).
Most animal fats form a solid at room temperature, while plant fats remain liquid at room temperature. Which of the following is a feature of lipids in plant membranes that best explains this difference?
(a) unsaturated hydrocarbons (b) longer hydrocarbon tails (c) higher levels of sterols (d) larger head groups