Pearson eText Biology: Life on Earth with Physiology -- Instant Access (Pearson+)
Pearson eText Biology: Life on Earth with Physiology -- Instant Access (Pearson+)
12th Edition
ISBN: 9780135755785
Author: Gerald Audesirk, Teresa Audesirk
Publisher: PEARSON+
bartleby

Concept explainers

Question
Book Icon
Chapter 36, Problem 1MC
Summary Introduction

Introduction:

Excretion is the removal of waste from the body through the urinary system. Animal’s lifestyle is responsible for the type of nitrogenous waste in the form of excretion.

Expert Solution & Answer
Check Mark

Answer to Problem 1MC

Correct answer:

Freshwater organisms excrete their feces in the form of ammonia. Therefore, option (a) is correct.

Option (a) is given as “Freshwater organisms are likely to excrete ammonia”.

Explanation of Solution

Justify reason for the correct statement:

Aquatic animals do not possess specific urinary system. They tend to excrete through gills and skin. So they are bound to excrete in the form of gas. Ammonia is the simplest form of nitrogenous waste in the form of gas.

Hence, option (a) is correct.

Justify reasons for the incorrect statements:

Option (b) is given as “ammonia is mostly excreted in urine”. Ammonia is a gas and urine contain water; additionally, the nitrogenous waste in urine is urea. Hence, it is a wrong answer.

Option (c) is given as “ammonia is the most complex of the three major nitrogenous wastes”. Ammonia is the simplest form of nitrogenous waste, urea is the most complex nitrogenous waste. Hence, it is a wrong answer.

Option (d) is given as “Humans convert ammonia to urea in the kidney”.

Conversion of ammonia into urea takes place inside the human body and this is called as urea cycle, but the site of the cycle is not the kidney, it is the liver. Hence, it is a wrong answer.

Hence, options (b), (c), and (d) are incorrect.

Conclusion

Ammonia is a gaseous form of nitrogenous waste. It is the simplest form, produced due to break down of amino acids in the human body. The liver performs the urea cycle to convert the ammonia into urea.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Students have asked these similar questions
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 36 Solutions

Pearson eText Biology: Life on Earth with Physiology -- Instant Access (Pearson+)

Knowledge Booster
Background pattern image
Biology
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
Human Physiology: From Cells to Systems (MindTap ...
Biology
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Cengage Learning
Text book image
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Biology
ISBN:9781305967359
Author:STARR
Publisher:CENGAGE L
Text book image
Biology (MindTap Course List)
Biology
ISBN:9781337392938
Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher:Cengage Learning
Text book image
Ebk:Nutrition & Diet Therapy
Health & Nutrition
ISBN:9780357391747
Author:DEBRUYNE
Publisher:Cengage
Text book image
Cardiopulmonary Anatomy & Physiology
Biology
ISBN:9781337794909
Author:Des Jardins, Terry.
Publisher:Cengage Learning,
Text book image
Biomedical Instrumentation Systems
Chemistry
ISBN:9781133478294
Author:Chatterjee
Publisher:Cengage