MHC class II cell surface proteins are found on what cells?
A. Erythrocytes only
B. Macrophages, B cells, and dendritic cells
C. Natural killer cells only
D. Neutrophils only
E. Neutrophils and natural killer cells
Answer: B
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Messenger RNA molecules contain information that is used to synthesize ___________.
A. nucleotides B. amino acids C. polypeptides D. fatty acids
Which of the following is the correct sequence for an altered protein that is secreted from the cell?
a. Golgi apparatus - ribosome - plasma membrane b. rough endoplasmic reticulum - Golgi apparatus - plasma membrane c. nucleus - smooth endoplasmic reticulum - Golgi apparatus d. smooth endoplasmic reticulum - plasma membrane - Golgi apparatus - ribosome e. Golgi apparatus - smooth endoplasmic reticulum - plasma membrane
In your biology lab, you are given a vial that contains fish urine. Your assignment is to predict whether the urine came from a fresh- or saltwater species. You discover that the urine contains a high concentration of salts. What is your prediction for the fish's habitat? What is the concentration of solutes in the fish relative to its environment?
A. Marine; hypoosmotic B. Freshwater; hypoosmotic C. Freshwater; hyperosmotic D. Marine; hyperosmotic
________ is the total of all chemical reactions occurring in the cell.
Fill in the blank(s) with the appropriate word(s).