Members of the alveolates are characterized by the presence of:
a. two or more flagella
b. chloroplast pigments
c. crystalline rod in the flagella
d. contractile vacuoles surrounded by a pellicle.
e. flattened vesicles under the plasma membrane.
e
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Leukocytes (white blood cells) account for about _______ of the cells in human blood.
A. 60% B. 10% C. 0.1% D. 1%
Primary growth involves:a
an increase in length. b. an increase in girth. c. a production of secondary xylem. d. a production of cork cells. e. a division of vascular cambium cells.
Which of the following is a clinical application for tumor markers?
A. Screening B. Diagnosis C. Monitoring D. All of the above
What is a main function of the structure in the accompanying figure labeled A?
A. It controls cell shape. B. It separates DNA during cell division. C. It helps nerve cells lengthen. D. It is found in hair. E. It helps regulate DNA replication.