Which of the following best describes what happens to an enzyme after it catalyzes a chemical reaction?

a. its mass decreases since part of the molecule is used up.
b. it is unchanged and can be used again for the same chemical reaction.
c. it becomes chemically bonded to the products of the reaction.
d. its shape changes, giving it different chemical and physical properties.

i think it is d but i am not sure

Control of the body is accomplished by which of the following body systems? nervous system and circulatory system endocrine and repertory system circulatory and respiratory systems nervous system and endocrine systems

Awoman whose sister tested positive for a specific mutation in the brca1 gene, which increases the risk for breast and ovarian cancer, is found not to have that mutation but does have a mutation of unknown significance near the known mutation site. how should this woman be counseled? select one: a. she should be informed that her risk for breast cancer is greater than the general population but not as great as her sister’s risk. b. she should be informed that because she does not have the mutation, her risk for breast cancer is not greater than that of the general population. c. she should be informed of her gene mutation status and be presented with all the available prophylaxis options and reconstruction options. d. she should be informed that she does not have the specific mutation but that because another mutation is present she should be vigilant about screening

Which best describes carbon dioxide’s path out of the body