Biology
Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
bartleby

Concept explainers

bartleby

Videos

Textbook Question
Book Icon
Chapter 34, Problem 1TY

Choanocytes are

  1. a. a group of protists that are believed to have given rise to animals.
  2. b. specialized cells of sponges that function to trap and eat small particles.
  3. c. cells that make up the gelatinous layer in sponges.
  4. d. cells of sponges that function to transfer nutrients to other cells.
  5. e. cells that form spicules in sponges.
Expert Solution & Answer
Check Mark
Summary Introduction

Introduction: Sponges belong to the group Porifera of invertebrate animals. These organisms are characterized by the presence of pores on their body surface. They are the simplest type of invertebrates of animal kingdom.

Answer to Problem 1TY

Correct answer: The specialized cells that function to trap and eat small particles are choanocytes. Hence, the correct answer is option b.

Explanation of Solution

Reason for correct answer:

Choanocytes are the specialized cells that are present in various different types of sponges. These cells are also called collar cells and possess a central flagellum. The central flagellum is surrounded by a collar of thin microvilli. These cells are very important as they form choanoderm, a type of layer found in sponges. These cells play a vital role in trapping and eating tiny particles.

Option b. is given as “specialized cells of sponges that function to trap and eat small particles”.

Choanocytes or collar cells are specialized cells of sponges that are very important for eating or trapping smaller particles present in the aquatic environment. Hence, the correct answer is option b.

Reasons for incorrect answer:

Option a. is given as, “a group of protists that are believed to have given rise to animals”.

Choanocytes are not the group of protists that have given rise to animals. They are specialized cells of sponges. Hence, option a. is incorrect.

Option c. is given as, “cells that make up the gelatinous layer in sponges”.

A gelatinous layer of sponges are called mesohyl. These layers are formed due to the cell to cell connections in sponges, and not because of choanocytes. Hence, option c. is incorrect.

Option d. is given as, “cells of sponges that function to transfer nutrients to other cells”.

Choanocytes perform the function of trapping and killing of small particles. These cells are not involved in the transfer of nutrients to other cells. Hence, option d. is incorrect.

Option e. is given as, “cells that form spicules in sponges”.

Spicules are the structures that provide support to the body of sponges. These spicules are formed by calcium carbonate or silica, and not by choanocytes. Hence, option e. is incorrect.

Hence, the options a., c., d., and e. are incorrect.

Conclusion

Choanocytes are specialized collar cells of sponges that have evolved to eat and trap smaller particles by creating water currents.

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
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
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
Concepts of Biology
Biology
ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:OpenStax College
Text book image
Biology Today and Tomorrow without Physiology (Mi...
Biology
ISBN:9781305117396
Author:Cecie Starr, Christine Evers, Lisa Starr
Publisher:Cengage Learning
Text book image
Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax
Text book image
Human Physiology: From Cells to Systems (MindTap ...
Biology
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Cengage Learning
Discovering the tree of life | California Academy of Sciences; Author: California Academy of Sciences;https://www.youtube.com/watch?v=AjvLQJ6PIiU;License: Standard Youtube License