Chargaff showed that DNA that has 20% guanine has ________ cytosine.
A) 20%
B) 30%
C) 60%
D) 40%
A) 20%
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You are preparing to administer the first of two units of packed RBCs. Evaluate each of the following statements about the safe administration of blood.
Answer T or F. Discuss why the false statements are incorrect. 1. Prime the correct tubing and filter with normal saline. 2. Verify K.L.'s identification with the secretary in the endoscopy suite. 3. Obtain baseline vital signs before starting the transfusion. 4. Begin the transfusion at a rate of 125ml per hour 5. Take K.L.'s vital signs 30 minutes after starting the transfusion. 6. Complete the transfusion within 6 hours of receiving the unit.
Three-spined stickleback fish (Gasterosteus aculeatus) show substantial heritable variation in gill-raker length related to differences in their diets. Longer gill rakers appear to function better for capturing open-water prey,
while shorter gill rakers function better for capturing shallow-water prey. Which of the following types of selection is most likely to be found in a large lake (open water in the middle and shallow water around the sides) with a high density of these fish? A) directional selection B) stabilizing selection C) disruptive selection D) sexual selection
In meiosis the separated sister chromatids move to opposite poles of the cell during
A. metaphase I. B. metaphase II. C. anaphase I. D. telophase I. E. anaphase II.
____ is an exocrine gland.
A. The kidney B. The thyroid C. An ovary D. The pancreas