Biology
11th Edition
ISBN: 9781259188138
Author: Peter H Raven, George B Johnson Professor, Kenneth A. Mason Dr. Ph.D., Jonathan Losos Dr., Susan Singer
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 55, Problem 1U
Source-sink metapopulations are distinct from other types of metapopulations because
a. exchange of individuals only occurs in the former.
b.
c. populations never go extinct in the former.
d. all populations eventually go extinct in the former.
Expert Solution & Answer
Summary Introduction
Introduction:
When the network of different populations exchanges its individuals, it is known as metapopulation. This happens because of the distribution of suitable and unsuitable habitat. If there is difference in the habitats of long term populations which affect its growth and decline is known as source-sink metapopulation.
Answer to Problem 1U
Correct answer:
The decline in the population is also considered in the source-sink metapopulation. Therefore, option b. is correct.
Explanation of Solution
Reason for the correct statement:
In source-sink population, there is continuous sending of dispersers from better areas that bolster the population in the areas that are poorer. The better areas or habitats act as the source and the poorer areas or habitats act as sink. If there is no continuous shifting of individuals, then the sink population increases and shows a negative growth and may lead to extinction.
Option b. is given as“populations with negative growth rates are a part of the former”.
As, “Source-sink metapopulations are distinct from the types of metapopulations because populations with negative growth rates are a part of the former”, is the right answer.
Hence, the option b. is correct.
Reasons for the incorrect statements:
Option a. is given as “exchange of individuals only occurs in the former”.
The exchange of individuals occurs in both metapopulations as well as in the source-sink populations. So, it is a wrong answer.
Option c. is given as “populations never go extinct in the former”.
In sink-source metapopulations, if the continuous replenishment is absent, then the poor habitat show negative growth rates that may lead to the extinction of species. So, it is a wrong answer.
Option d. is given as “all populations eventually go extinct in the former”.
Not all the populations show negative growth; only a part of population of poorer habitat show negative growth and extinct. So, it is a wrong answer.
Hence, options a., c., and d. are incorrect.
Conclusion
The metapopulations involves the migration of individuals from one group to another group in a population. In source-sink population, one of the populations with poor habitat may show negative growth.
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19. On the diagram below
a. Label the three pictures as: DNA; polypeptide; or RNA.
b. Label the arrows as: translation or transcription/RNA processing.
c. Add the following details to the diagram.
Promoter region
TATA box
Transcription start site
Transcription terminator
Intron (A,B,C,D)
Exons (1,2,3,4,5)
Splice sites
5' cap
5' UTR (untranslated region)
3' poly A tail
3' UTR (untranslated region)
Translational start (AUG)
Translational stop (UGA, UAG, or UAA)
N and C ends of polypeptide
0000
Match the letter labels in the figure below to the terms. Some letter
labels are not used.
MNNNNNNIN
M
C
B
A
M
D
F
E
H
K
G
8
The diagram below illustrates a quorum sensing pathway from Staphylococcus aureus. Please answer the following questions.
1. Autoinduction is part of the quorum sensing system. Which promoter (P2 or P3) is critical for autoinduction?
2)This staphylococcus aureus grows on human wounds, causing severe infections. You would like to start a clinical trial to treat these wound infections. Please describe:
a) What molecule do you recommend for the trial. Why?
b) Your trial requires that Staphylococcus aureus be isolated from the wound and submitted to genome sequencing before admittance. Why? What are you testing for?
3) If a mutation arises where the Promoter P3 is constitutively active, how would that influence sensitivity to AIP? Please explain your rationale.
4) This pathway is sensitive to bacterial cell density. Describe two separate mutation that would render the pathway active independent of cell density. Briefly explain your rationale.
Mutation 1
Mutation 2
Chapter 55 Solutions
Biology
Ch. 55 - Source-sink metapopulations are distinct from...Ch. 55 - The potential for social interactions among...Ch. 55 - When ecologists talk about the cost of...Ch. 55 - Prob. 4UCh. 55 - The difference between exponential and logistic...Ch. 55 - Prob. 6UCh. 55 - Which of the following is an example of a...Ch. 55 - If the size of a population is reduced due to a...Ch. 55 - In populations subjected to high levels of...Ch. 55 - In a population in which individuals are uniformly...
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