CAMPBEL BIOLOGY:CONCEPTS & CONNECTIONS
10th Edition
ISBN: 9780136538820
Author: Taylor
Publisher: INTER PEAR
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Chapter 25, Problem 21TYK
Summary Introduction
To graph:
The given data and also determine whether a scatter plot or a bar chart will be a better choice and draw the conclusion from the data.
Concept introduction:
The penguins are endotherms as they can maintain a constant internal body temperature through heat generated by
During the Antarctic winter, the penguins lose heat generated by metabolism through convection and conduction. This poses a They overcome this problem of heat loss by huddling behavior.
Given data:
The data collected from the penguin colonies in the Antarctic is given below:
Huddle Number | Outside Temperature During Huddle (in Celsius) | Duration of Huddle (minutes) |
1 | -21 | 195 |
2 | -45 | 425 |
3 | -9 | 50 |
4 | -47 | 416 |
5 | -18 | 80 |
6 | -39 | 325 |
7 | -24 | 187 |
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Cockroaches are nocturnal insects and are active at night and inactive during the day. You place cockroaches in an experimental chamber which gives you complete control over temperature, relative humidity, and light. Throughout your experiment you keep temperature and relative humidity constant, but you vary light as follows: For the first 3 days, the lights go off at 6 PM each day and come one at 6 AM (a 12/12 light/dark cycle). From days 4-11, you then keep the cockroaches in constant darkness (0/24 light/dark) and you then restore the 12/12 light dark cycle starting on day 12. You measure the activity of the insects and indicate this using the gray bars shown in the graph below:
During the 12L/12D period starting on day 12 through day 14:
a. the cockroaches are showing entrainment to the zeitgeber of photoperiod.
b. the cockroaches are exhibiting free run
c. the activity of the per gene in the optic lobes is increasing and decreasing in a 24-hr cycle.
d. the…
Cockroaches are nocturnal insects and are active at night and inactive during the day. You place cockroaches in an experimental chamber which gives you complete control over temperature, relative humidity, and light. Throughout your experiment you keep temperature and relative humidity constant, but you vary light as follows: For the first 3 days, the lights go off at 6 PM each day and come one at 6 AM (a 12/12 light/dark cycle). From days 4-11, you then keep the cockroaches in constant darkness (0/24 light/dark) and you then restore the 12/12 light dark cycle starting on day 12. You measure the activity of the insects and indicate this using the gray bars shown in the graph below:
During the 0L/12D period from days 4-11:
a. the cockroaches are showing entrainment.
b. the per gene in the optic lobes is inactive.
c. the cockroaches are exhibiting free run.
d. the cockroaches are exhibiting arhythmic activity.
e. a and b
f. c and d
Cockroaches are nocturnal insects and are active at night and inactive during the day. You place cockroaches in an experimental chamber which gives you complete control over temperature, relative humidity, and light. Throughout your experiment you keep temperature and relative humidity constant, but you vary light as follows: For the first 3 days, the lights go off at 6 PM each day and come one at 6 AM (a 12/12 light/dark cycle). From days 4-11, you then keep the cockroaches in constant darkness (0/24 light/dark) and you then restore the 12/12 light dark cycle starting on day 12. You measure the activity of the insects and indicate this using the gray bars shown in the graph below:
1. Based on these results, you can correctly conclude that:
a. activity in cockroaches is controlled by an endogenous rhythm.
b. activity in cockroaches is under only exogenous control.
c. the zeitgeber for activity is temperature fluctuation.
d. the data show that the activity of the per gene in…
Chapter 25 Solutions
CAMPBEL BIOLOGY:CONCEPTS & CONNECTIONS
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