Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Chapter 18, Problem 13TYU
SCIENCE. TECHNOLOGY, AND SOCIETY Trace amounts of dioxin were prsent in Agent Orange, a defoliant sprayed on Vegetation during the Vietnam War. Animal tests suggest that dioxin can cause birth defects, cancer, liver and thymus damage, and immune system suppression, sometimes leading to death. but the animal tests are equivocal; a hamster is not affected by a dose that can kill a guinea pig. Dioxin acts like a Steroid hormone, entering a cell and binding to a cytoplasmic receptor that then blnds the cell's DNA.
- (a) Discuss how this mechanism might help explain the vari- ety of dioxin's effects on different body systems and in different animals.
- (b) Discuss how you might determine whether a type of illness is related to dioxin exposure. Next, discuss how you might determine whether a particular individual became ill as a result of exposure to dioxin. Which would be more difficult to demonstrate? Why?
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TTX is found in a variety of animals and is often used as a defense against predation. Puffer fish-a delicacy in Japanese cuisine-a well-known cause of accidental, sometimes fatal. TTX food poisoning in humans. A single newt killed three hunters after it got into their coffee pot. As the newt was boiled over the campfire, a substance on its skin-called tetrodotoxin (TTX)-contaminated the water to make a lethal brew . The newt's body was not eaten-- the campers simply drank water in which it was boiled If the poisoning resulted from drinking contaminated water alone, what does this tell you about the solubility and stability of the TTX present on the newt's skin?
Engiisfi (elij
Two of the structures below are found in nature. In
fact, they are human hormones. One of the structures
is a synthetic drug used in treating a particular class of
metabolic disorders. Examine the structures carefully
and decide which is the synthetic compound.
OH
OH
OH
OH
CH,
Select one:
o Compound A is the synthetic.
o Compound B is the synthetic.
o Compound C is the synthetic.
o Trick question. All are clearly synthetic. (NOT AN
ANSWER)
1. Plays an important role in intracellular signaling
2. helps maintain an erection in men
3. has a key role in glycoprotein synthesis
4. Helps control diabetes by reducing blood sugar and insulin resistance
5. facilitates absorption of minerals such as Potassium, Magnesium, and Calcium
6. removes toxic substances from the breakdown of muscle proteins during intensive exercise
7. has a synergistic effect with Vitamin E and Selenium
8. Needed to produce tryptophan
9. Protects myelin sheath
10. facilitates removal of heavy metals such as mercury
Choices for the answers:
A. Alanine
B. Cysteine
C. Glutamine
D. Glutathione
E. Glycine
F. Serine
G. Taurine
H. Aspargine
I. Aspartic Acid
J. Proline
K. L-arginine
L. Tyrosine
Chapter 18 Solutions
Campbell Biology
Ch. 18.1 - How does binding of the trp corepressor to the trp...Ch. 18.1 - Describe the binding of RNA Polymerase,...Ch. 18.1 - WHAT IF? A certain mutation in E. coli changes...Ch. 18.2 - In general, what are the effects of histone...Ch. 18.2 - MAKE CONNECTIONS Speculate about whether the same...Ch. 18.2 - Compare the roles of general and specific...Ch. 18.2 - Once mRNA encoding a particular protein reaches...Ch. 18.2 - WHAT IF? Suppose you compared the nucleotide...Ch. 18.3 - Compare miRNAs and siRNAs, including their...Ch. 18.3 - WH AT IF? Suppose the mRNA being degraded in...
Ch. 18.3 - Prob. 3CCCh. 18.4 - MAKE CONNECTIONS As you learned in Chapter 12,...Ch. 18.4 - MAKE CONNECTIONS Explain how the signaling...Ch. 18.4 - How do fruit fly maternal effect genes determine...Ch. 18.4 - Prob. 4CCCh. 18.5 - Prob. 1CCCh. 18.5 - Under what circumstances is cancer considered to...Ch. 18.5 - MAKE CONNECTIONS The p53 protein can activate...Ch. 18 - Compare and contrast the roles of a corepressor...Ch. 18 - Describe what must happen in a cell for a gene...Ch. 18 - Why are miRNAs called noncoding RNAs? Explsin how...Ch. 18 - Describe the two main processes that cause...Ch. 18 - Compare the usual functions of proteins encoded by...Ch. 18 - If a particular operon encodes enzymes for making...Ch. 18 - Muscle cells differ from nerve cells mainly...Ch. 18 - The functioning of enhancers is an example of (A)...Ch. 18 - Cell differentiation always involves (A)...Ch. 18 - Which of the following is an example of...Ch. 18 - What would occur if the repressor of an inducible...Ch. 18 - Absence of bicoid in mRNA from a Drosophila egg...Ch. 18 - Which of the following statements about the DNA in...Ch. 18 - Within a cell, the amount of protein made using a...Ch. 18 - Prob. 10TYUCh. 18 - draw it The diagram below shows five genes,...Ch. 18 - Prob. 12TYUCh. 18 - SCIENCE. TECHNOLOGY, AND SOCIETY Trace amounts of...Ch. 18 - WRITE ABOUT A THEME: INTERACTIONS In a Short essay...Ch. 18 - SYNTHESIZE YOUR KNOWLEDGE The flashlight fish has...
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