The phase of mitosis that begins as spindle fibers pull sister chromatids apart at the centromere is
A. metaphase.
B. anaphase.
C. telophase.
D. prophase.
E. interphase.
B
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Which of these covalently modifies proteins by phosphorylation?
A. Metal ions, such as Fe2+ B. Any ligand that can bind to specific binding sites C. Enzymes called protein phosphatases D. Enzymes called protein kinases E. Other proteins called allosteric proteins
Which of the following activities expends the most calories per hour?
A) speed walking B) jogging C) slow walking D) competitive swimming E) climbing stairs
Identify the characteristics associated with endocrine glands
a. lack ducts b. secrete chemicals directly into the blood c. derived from epithelial tissue d. include the parathyroids e. all of these
The juxtaglomerular apparatus ________
A) contains granular cells in the afferent arteriole that sense blood pressure B) contains a region of chemoreceptor cells called the macula densa in the distal nephron loop C) is found where the most distal part of the ascending limb of the nephron loop touches the afferent arteriole, contains granular cells in the afferent arteriole that sense blood pressure, and contains a region of chemoreceptor cells called the macula densa in the distal nephron loop D) is found where the most distal part of the ascending limb of the nephron loop touches the afferent arteriole