The sodium/potassium pump is an example of:
A. a symporter.
B. passive transport.
C. an antiporter.
D. channel-mediated diffusion.
E. None of these choices is correct.
Answer Key: C
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Match each description below with the type of cell junction it characterizes:
a. adherens junction b. desmosome c. hemidesmosome d. tight junction e. gap junction ____________ Transmembrane proteins on the plasma membrane arranged in a ring that bind to a similar protein ring on an adjacent cell to allow transfer of materials between the cells. ____________ A mesh-like attachment between cells formed by binding of transmembrane proteins of one cell to the same protein type on the adjacent cell, preventing substances from passing between cells. ____________ A band-like attachment where cadherins attach to microfilaments inside the cell and to the extracellular domain of an adjacent cell's cadherin proteins on the outside of the cells. ____________ A button-like point of attachment where integrins attach to intermediate filaments inside the cell and to a protein of the extracellular matrix on the outside of the cells. ____________ A button-like point of attachment where cadherins attach to intermediate filaments inside the cell and to the extracellular domain of an adjacent cell's cadherin proteins on the outside of the cells. What will be an ideal response?
During prophase, duplicated chromosomes
a. consist of chromatids. b. contain centromeres. c. consist of nucleoproteins. d. contain all of the above.
In woody plants, the lateral transport of materials occurs through:a
lenticels. b. pith
c. pith rays. d. phloem fiber caps. e. rays.
A physician discovered a cancerous tumor in the cartilage of a patient. What type of tumor is this?
A. retroviral B. leukemia C. sarcoma D. cyst E. myeloma