Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 15TYU
SYNTHESIZE YOUR KNOWLEDGE
Given that the function of egg yolk is to nourish and support the developing chick, explain why egg yolks are so high in fat, protein, and cholesterol.
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background information: The slow block to polyspermy involves a permanent modification of the egg surface, usually through exocytosis of the cortical granules. In the 1970s, Dave Epel carried out experiments that led to the conclusion that a Ca2+ rise in the egg is both necessary and sufficient to trigger cortical granule exoctyosis (CGE).
Experiment (b) – Dr. Epel injects a small amount of Ca2+ into unfertilized eggs and observes CGE almost immediately
For the experiment above, is it an example of correlation, loss-of-function or gain-of function? Then, indicate the predicted result.
Critical periods of fetal development
Human nutrition starts during pregnancy, the moment the fertilized egg attaches itself to the uterine wall and starts receiving nutrients from the mother.
At the placenta, the mother and the embryo exchange nutrients, oxygen and waste. In this way, the embryo receives the nutrition it needs to grow, and allows the
mother to handle the processing of waste. The nutrients received by the embryo depend on the nutrients consumed by the mother in her current diet, as well as those
in her nutrient reserves. If the mother lacks nutrients, the embryo will lack them as well.
Red blood cells, bacteria and large proteins in the mother's blood cannot pass to the embryo, but some potentially dangerous substances can. Alcohol, caffeine, illicit
drugs, prescription and over-the-counter medications can cross the placenta barrier and enter the embryo.
Environmental pollutants such as mercury, arsenic and lead can cross the placenta barrier too. Some of these…
Background: The slow block to polyspermy involves a permanent modification of the egg surface, usually through exocytosis of the cortical granules. In the 1970s, Dave Epel carried out experiments that led to the conclusion that a Ca2+ rise in the egg is both necessary and sufficient to trigger cortical granule exoctyosis (CGE).
Experiment (c) – Dr. Epel injects a calcium chelator (called EGTA; chelators act as specific “sinks” or “magnets” for ions) into unfertilized eggs and then adds sperm. The sperm bind and fuse with the eggs, but no CGE occurs.
For the experiment above, describe it as correlation, loss-of-function or gain-of function. Then, indicate the predicted result.
Chapter 3 Solutions
Campbell Biology in Focus (2nd Edition)
Ch. 3.1 - How are gasoline and fat chemically similar?Ch. 3.1 - Which molecules in Figure 3.4a re isomers? For...Ch. 3.1 - Prob. 3CCCh. 3.1 - Prob. 4CCCh. 3.2 - How many molecules of water are needed to...Ch. 3.2 - WHAT IF? Suppose you eat a serving of fish. What...Ch. 3.3 - Write the formula for a monosaccharide that has...Ch. 3.3 - A dehydration reaction joins two glucose molecules...Ch. 3.3 - WHAT IF? After a cow is given antibiotics to treat...Ch. 3.4 - Compare the structure of a fat (triglyceride) with...
Ch. 3.4 - Why are human sex hormones considered lipids?Ch. 3.4 - Prob. 3CCCh. 3.5 - Why does a denatured protein no longer function...Ch. 3.5 - What parts of a polypeptide participate in the...Ch. 3.5 - WHAT IF? Where would you expect a polypeptide...Ch. 3.6 - DRAW IT Go to Figure 3.27a and, for the top three...Ch. 3.6 - Prob. 2CCCh. 3.7 - How would sequencing the entire genome of an...Ch. 3.7 - Given the function of DNA, why would you expect...Ch. 3 - Prob. 1TYUCh. 3 - Which functional group is not present in this...Ch. 3 - MAKE CONNECTIONS Which chemical group is most...Ch. 3 - Prob. 4TYUCh. 3 - Which of the following statements concerning...Ch. 3 - The structural level of a protein least a fleeted...Ch. 3 - Enzymes that break down DNA catalyze the...Ch. 3 - Prob. 8TYUCh. 3 - The molecular formula for glucose is C6H12O6. What...Ch. 3 - Construct a table that organizes the following...Ch. 3 - Prob. 11TYUCh. 3 - Prob. 12TYUCh. 3 - FOCUS ON ORGANIZATION Proteins, which have diverse...Ch. 3 - Prob. 14TYUCh. 3 - SYNTHESIZE YOUR KNOWLEDGE Given that the function...
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