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

Biology & Microbiology

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Messenger RNA molecules contain information that is used to synthesize ___________.  

A.  nucleotides B.  amino acids C.  polypeptides D.  fatty acids

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

________ is the total of all chemical reactions occurring in the cell.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology