Biology 189 Exam study questions with
correct answers
Which of the following best describes metabolism? - correct answer -the cycling of energy
Isotopes are - correct answer -variant forms of atoms that have different numbers of neutrons and a
different mass
Protein, lipid, nucleic acid, and carbohydrate are based on which one of the following elements - correct
answer -Carbon
Which of the following molecules does not contain carbon? - correct answer -Water
Which of the following is an example of genetic material - correct answer -DNA
Breakdown of complex carbohydrates begins in which organ in the human digestive system - correct
answer -Mouth
Most of the absorption of nutrients other than water, such as amino acids and nucleotides, takes place
in which organ of the human digestive system? - correct answer -small intestine
Breakdown of proteins begins in which organ of the human digestive system? - correct answer -stomach
The majority of water absorption takes place in which organ of the human digestion system? - correct
answer -large intestines
Which one of the following in the human digestive helps neutralize stomach acid when it enters the
small intestine? - correct answer -pancreatic juices
The ring-shaped muscle that prevents food from backtracking through the digestive system is which one
of the following? - correct answer -Sphincter
