Naive B and T Lymphocytes Are Small, Quiescent Cells with Little

question 10

Multiple Choice

Naive B and T lymphocytes are small, quiescent cells with little cytoplasm and low metabolic activity. Yet within hours after being activated following encounter with their antigen, these cells enlarge and up-regulate many biosynthetic and metabolic pathways. Approximately one day later, the cells begin dividing, and for several days they are the most rapidly dividing cells in the body, undergoing 2-4 rounds of cell division every day. In order to maintain this phenomenal rate of cell division, lymphoblasts must:

• A) Use the large energy stores accumulated by them when they were naive quiescent cells prior to their activation
• B) Engulf their neighboring small quiescent lymphocytes in order to take their lipids and proteins for raw material
• C) Up-regulate synthesis of mRNA and proteins, some of which encode for glucose transporters and enzymes used for glycolysis
• D) Phagocytose extracellular proteins and lipids and degrade them for energy production
• E) Macropinocytose metabolites and sugars from the blood for use in glycolysis

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Definitions:

Total Revenue

The sum of money a company earns from selling its products or services, prior to deducting any costs.

Elastic

Describes a situation in which the quantity demanded or supplied of a good or service changes significantly as its price changes.

Inelastic

A characteristic of goods whereby a change in price leads to a relatively smaller change in the quantity demanded or supplied.

Total-revenue Test

A method used to determine the price elasticity of demand by observing changes in total revenue as a result of price alterations.