Concept explainers
Introduction: Animals have a number of characteristics that distinguish them from other organisms. The characteristics include multicellularity, the presence of an extracellular matrix, heterotrophic feeding, and possession of nervous and muscle tissues.
Answer to Problem 1TY
Correct answer:
Possession of cell walls is not a distinguishing characteristic of animals. Hence, the correct answer is option b.
Explanation of Solution
Reason for correct answer:
Animals can be defined as multicellular heterotrophs with cells that lack cell walls, the capacity to move at some point in their life cycle, and the ability to reproduce sexually.
Option b. is given as “possession of cell walls”.
Animal cells lack a cell wall and are quite flexible. The cells of plants,
Reasons for incorrect answer:
Option a. is given as, “the capacity to move at some point in the life cycle”.
Most animals have a muscle system, which allows them to move in their environment. Hence, option a. is incorrect.
Option c. is given as, “multicellularity”.
Animals are multicellular in nature, for example sponges (a simple type of animal). Hence, option c. is incorrect.
Option d. is given as, “heterotrophy”.
Animals obtain their food by eating other organisms. Plants and algae are grouped as autotrophs since they produce their own food. Hence, option d. is incorrect.
Option e. is given as, “All of the above are characteristics of animals”.
Animal cells do not possess a cell wall. Therefore, presence of cell wall in animal cells is not considered as a distinguishing characteristic of animals. Hence, option e. is incorrect.
Hence, the options a., c., d., and e. are incorrect.
Thus, possession of cell walls is not a distinguishing characteristic of animals.
Want to see more full solutions like this?
Chapter 33 Solutions
BROOKER BIOLOGY
- What are Clathrin coated vesicles and what is their function?arrow_forwardHow is a protein destined for the Endoplasmic Reticulum (ER), imported into the ER? Be concise.arrow_forwardFind out about the organisations and the movements aimed at the conservation of our natural resources. Eg Chipko movement and Greenpeace. Make a project report on such an organisation.arrow_forward
- What are biofertilizers and mention the significancearrow_forwardPCBs and River Otters: Otters in Washington State’s Green-Duwamish River have high levels of polychlorinated biphenyls (PCBs) in their livers. PCBs can bind to the estrogen receptors in animals and disrupt the endocrine system of these otters. The PCBs seem to increase the estrogen to androgen ratio, skewing the ratio toward too much estrogen. How would increased estrogen affect the river otter population? Based on your reading of the materials in this unit, what factors can affect fertility in humans? Explain how each of the factors affecting human fertility that you described can disrupt the human endocrine system to affect reproduction.arrow_forwardOther than oil and alcohol, are there other liquids you could compare to water (that are liquid at room temperature)? How is water unique compared to these other liquids? What follow-up experiment would you like to do, and how would you relate it to your life?arrow_forward
- Selection of Traits What adaptations do scavengers have for locating and feeding on prey? What adaptations do predators have for capturing and consuming prey?arrow_forwardCompetition Between Species What natural processes limit populations from growing too large? What are some resources organisms can compete over in their natural habitat?arrow_forwardSpecies Interactions Explain how predators, prey and scavengers interact. Explain whether predators and scavengers are necessary or beneficial for an ecosystem.arrow_forward
- magine that you are conducting research on fruit type and seed dispersal. You submitted a paper to a peer-reviewed journal that addresses the factors that impact fruit type and seed dispersal mechanisms in plants of Central America. The editor of the journal communicates that your paper may be published if you make ‘minor revisions’ to the document. Describe two characteristics that you would expect in seeds that are dispersed by the wind. Contrast this with what you would expect for seeds that are gathered, buried or eaten by animals, and explain why they are different. (Editor’s note: Providing this information in your discussion will help readers to consider the significance of the research).arrow_forwardWhat is the difference between Uniporters, Symporters and Antiporters? Which of these are examples of active transport?arrow_forwardWhat are coupled transporters?arrow_forward
- Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSONBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxAnatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
- Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & CompanyLaboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education