Biological Science (6th Edition)
6th Edition
ISBN: 9780321976499
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Emily Taylor, Greg Podgorski, Jeff Carmichael
Publisher: PEARSON
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Chapter 23, Problem 11PIAT
Are toucans important to tropical forests?
Human activities are causing the fragmentation of the Brazilian Atlantic rain forest. One consequence is that toucans have become extinct or nearly extinct in some of the forest fragments. Does the absence of toucans affect the forest?
Toucans disperse seeds of key forest species such as juçara palms by eating the fruit and defecating the seeds in new locations, sometimes more than a kilometer away. If there are no toucans, is the genetic diversity of palms likely to increase or decrease within forest fragments (and why)?
a. increase (due to increased genetic drift)
b. decrease (due to decreased gene flow)
c. decrease (due to decreased mutation rate)
d. decrease (due to decreased natural selection)
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Data…
Ch.23
How is Salmonella able to cross from the intestines into the blood?
A. it is so small that it can squeeze between intestinal cells
B. it secretes a toxin that induces its uptake into intestinal epithelial cells
C. it secretes enzymes that create perforations in the intestine
D. it can get into the blood only if the bacteria are deposited directly there, that is, through a puncture
—
Which virus is associated with liver cancer?
A. hepatitis A
B. hepatitis B
C. hepatitis C
D. both hepatitis B and C
—
explain your answer thoroughly
Chapter 23 Solutions
Biological Science (6th Edition)
Ch. 23 - PROCESS OF SCIENCE In what sense is the...Ch. 23 - 2. Why isn’t inbreeding considered an evolutionary...Ch. 23 - 3. CAUTION Why is genetic drift aptly named?
a. It...Ch. 23 - 4. True or false? Gene flow can either increase or...Ch. 23 - 5. QUANTITATIVE In a population of 2500, how many...Ch. 23 - 6. In the 1700s and 1800s, royalty in Europe often...Ch. 23 - 7. CAUTION Determine what is incorrect in the...Ch. 23 - MODEL Draw a small concept map (BioSkllls 12 )...Ch. 23 - 9. QUANTITATIVE In humans, albinism is caused by...Ch. 23 - Prob. 10TYPSS
Ch. 23 - Are toucans important to tropical forests? Human...Ch. 23 - QUANTITATIVE Toucans can eat fruits with large...Ch. 23 - 13. Do these data illustrate directional,...Ch. 23 - 14. Large seeds carry more resources than small...Ch. 23 - 15. PROCESS OF SCIENCE The data in the graphs are...Ch. 23 - 16. SOCIETY If you were a journalist covering this...
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