In the centrifuged sample of blood illustrated, which number indicates the layer containing water, plasma proteins, nutrients, and waste products?
A. 1
B. 2
C. 3
D. None of the numbers indicate that component of blood.
Answer: A
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_____ is a state of high metabolic activity in which the cell does most of its growing.
A. Prophase B. Metaphase C. Anaphase D. Telophase E. Interphase
Sexual differentiation of the embryo is normally determined by:
A. the number of chromosomes, with males having 22 pairs and females having an extra pair of XX chromosomes. B. the presence of two X chromosomes, which causes the primordial testes to degrade. C. the presence of one Y chromosome, which causes the primordial ovaries to degrade. D. the presence of the Y chromosome, which directs the undifferentiated gonads to develop into testes (when there is one X chromosome present as well). E. hormones produced by the placenta.
Which of the following would be caused by a contraction of smooth muscle?
A. Goose bumps B. Blood leaving the left ventricle of the heart C. Blinking the eyelids D. Elevating the eyebrows E. Deep inspiration
Which chemical type of hormone has a longer half-life?
A. Water-soluble B. Lipid-soluble C. Protein D. Amino acid derivative