Arrange the following in the proper order in which they occur during clonal selection.
1. Helper T cells are activated.
2. Macrophages ingest antigen.
3. B cells differentiate into plasma cells and memory cells.
A. 1, 2, 3
B. 2, 1, 3
C. 2, 3, 1
D. 3, 2, 1
E. 3, 1, 2
B. 2, 1, 3
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This simple plant tissue has elongated cells,
living cells with unevenly thick cell walls that function in support. This plant tissue is
a. parenchyma. b. sclerenchyma. c. collenchyma. d. xylem. e. phloem.
Cardiac muscle's sole function is to
a. help move blood to supply itself with oxygen and nutrients. b. pump blood. c. control blood pressure. d. control heart rate. e. oxygenate the blood.
Urine moves from the urinary bladder to the external environment through the ____
a. renal artery b. renal vein c. urethra d. nephron e. ureter
A method of asexual plant propagation often used in fruit agriculture is called ____.
A. grafting B. pericycle extensions C. vegetative reproduction D. cutting extension E. sucker propagation