Which one of the following nonhormonal chemical messengers is important in local control of blood flow and blood clotting?
A) prostaglandins
B) nerve growth factor
C) tumor angiogenesis growth factor
D) histamine
E) epidermal growth factor
A
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The chromosomes are moving to opposite
sides of the cell during
a. anaphase. b. metaphase. c. interphase. d. prophase. e. telophase
When an enzyme linked receptor is activated, a conformational change activates the extracellular
kinases. __________________ Indicate whether the statement is true or false.
In the process of organismic respiration:a
oxygen is extracted from the environment by the organism and delivered to its cells. b. the citric acid cycle takes place in the cells. c. carbohydrates are broken down and electrons are transferred to oxygen. d. there is an accumulation of lactic acid in the tissues due to the absence of oxygen. e. carbon dioxide is produced in the Krebs cycle.
Clonal selection and differentiation of B cells activated by antigen exposure leads to the production of _____
A) large quantities of the antigen initially recognized B) vast numbers of B cells with random antigen-recognition receptors C) long-lived erythrocytes that can later secrete antibodies for the antigen D) short-lived plasma cells that secrete antibodies for the antigen