All organisms that are derived from a single common ancestor make up a clade
Indicate whether the statement is true or false
TRUE
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Multiple functional groups are able to attach to macromolecules. What is the most useful characteristic that enables the attachment of multiple functional groups?
A. One hydrogen ionic bond. B. Four carbon covalent bonds. C. Two oxygen covalent bonds. D. Three nitrogen ionic bonds.
When an axon is at rest, all of the following are true EXCEPT:
a. There are more K+ ions inside the cell. b. The membrane potential is approximately -70 mV. c. There is no electrical charge associated with the cell. d. There is a more negative charge inside the cell.
The seed coat forms from the
a. zygote. b. cotyledon. c. nucleus. d. integuments. e. embryo sac.
A buffer system
a. makes new hydrogen ions. b. eliminates hydrogen ions already present. c. binds carbon ions. d. releases hydrogen ions. e. produce excess acid.