Only antigen-presenting cells
A. produce antibodies.
B. activate cytotoxic T cells.
C. produce MHC class I molecules.
D. produce MHC class II molecules.
D
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The _______ was labeled using the radioisotope 32P in the Hershey-Chase experiments
A. RNA B. DNA C. protein D. carbohydrates
The ____ tissue system is made up of interconnecting cells that form transport channels throughout the plant
a. ground b. organ c. vascular d. dermal e. xylem
Which type of white blood cell secretes specific antibodies?
A) T cell B) Cytokine C) B cell D) Erythrocyte
From what substance do liposomes spontaneously form and why are they important?
a. Liposomes spontaneously form from DNA and proteins and provide a rigid structure to support the cell. b. They are formed from phospholipid monolayers. These phospholipid monolayers provide a stable barrier between the internal and external environments. c. Liposomes were the first rigid cell walls providing support for the living cell and a barrier between the external and internal environments. d. Liposomes form from phospholipid bilayers and provide a barrier between an external environment and an internal environment; this creates an internal environment where specific chemical reactions needed to establish a living cell can occur separately from the external environment.