Which best describes the energy of activation?
a. A type of exergonic reaction
b. A type of endergonic reaction
c. The energy required to break existing bonds
d. The catalysts needed to raise a reaction's rate
e. The enzymes required to lower a reaction's rate
c
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. When performing an experiment, what is another word used to describe the treatment?
a. hypothesis b. control c. variable d. data
What is the function of erythrocytes?
a. carry oxygen b. form clots c. fight off infections d. produce blood cells e. secrete erythropoietin
Which of the following elements favors
fossilization?
a. death in an isolated area b. rapid burial c. a bony skeleton d. all of these elements favor fossilization e. one or more of these is an element that does NOT favor fossilization
Antibody genes
A) contain both constant and variable regions. B) are formed by cutting and splicing DNA in B cells during development. C) are made from two heavy and two light chains, each of which has a variable region. D) each recognize one antigen and are the only antibody made by their B cell. E) All of these