In plants, the vascular tissue made of dead cells that transport water and minerals from the roots is called
A) xylem.
B) phloem.
C) lignin.
D) meristem.
Answer: A
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Immunity results from the actions of cells that circulate throughout the body, primarily through the blood and lymph
Indicate whether the statement is true or false.
Identify the signals necessary for maturation and activation of a B cell by a T-dependent antigen.
A. Antigen is internalized and presented by a dendritic cell. B. B-cell growth factors secreted by TH2 cells mature and activate the antigen-stimulated B cell. C. Antigen binds to a B-cell receptor. D. B cell secretes cytokines to activate a T helper cell.
The principle of nuclear equivalence states that:a
developing cells become specialized to carry out specific functions. b. developing cells follow particular differentiation pathways. c. there is no loss of genetic information through determination or differentiation. d. differential gene expression is responsible for variation among cells. e. nuclear changes can take place during the entire life of an individual.
Which of the following chemicals acts as a mordant in the Gram stain procedure?
A) Crystal violet B) Iodine C) Ethyl alcohol D) Safranin