Concept explainers
To determine:
Whether the statement “Animal cells have chitin walls.” is true or false.
Introduction:
Chitin is a chemical compound which is present in the cell walls of the
Answer to Problem 1SQ
Correct answer:
The given statement “Animal cells have chitin walls,” is false.
Explanation of Solution
Chitin is one of the major components of the protective armors of various organism such as spider, beetle, crab, and shrimps. Chitin is not present in the cell wall of the animals. The given statement is false because:
• The cells walls or cell membrane of the animals is made up of proteins, carbohydrates, and lipids. Chitin is present in the cell walls of the fungi and is the main component of the exoskeleton of crustaceans and arthropods.
Therefore, the animal cell does not contain chitin.
Want to see more full solutions like this?
Chapter 23 Solutions
EBK BIOLOGY: CONCEPTS AND APPLICATIONS
- Which statements correctly describe the rough endoplasmic reticulum (rough ER)? It has ribosomes bound to its membrane. It synthesizes proteins that will be sent out of the cell. It stores and releases calcium ions. It is connected to the membrane of the nucleus. It is used to transport mRNA to the cell membrane.arrow_forwardThe plasma membrane is composed of a variety of lipid molecules. 1. Phosphatidylethanolamine 2. Phosphatidylcholine 3. Phosphatidylinositol 4. Phosphatidylserine 5. Sphingomyelin 6. Glycolipids 7. Cholesterol. Which lipids contain sugar molecules?arrow_forwardTrue or false? Ribosomes are only found in eukaryotes.arrow_forward
- TRUE or FALSE: Eukaryotic cells feature membrane bound organelles that create specialized compartments within a single cell. The primary structure of the outer cell membrane is a double layer but the membranes that enclose organelles are only single layer. Choose. 1. Which of the following is one of the ways that will keep the membranes of such vegetables to remain fluid when it is extremely cold? A) by increasing the percentage of unsaturated phospholipids in the membrane B) by decreasing the number of hydrophobic proteins in the membrane C) by increasing the percentage of cholesterol molecules in the membrane D) by co-transport of glucose and hydrogen 2. After a membrane freezes and then defrost, it often turns out to be loose to solutes. The best logical reason for this is that: A) the lipid bilayer loses its fluidity when it freezes. B) transport proteins become nonfunctional during freezing C) the integrity of the lipid bilayer is broken when the membrane freezes D) the…arrow_forwardIn most cells, the lipid molecules that form the cell membrane bond to one another to form a firm, impermeable sheet. True or Flasearrow_forwardWhich of the following statement is not false? Cellulose containing foods can be consumed by humans Nucleotide is composed of pentose sugar and nitogenous base Amino acid is the building block of protein Smooth ER contains ribosome The space between outer nuclear membrane and inner nuclear membrane is called perinuclear space. True Falsearrow_forward
- Cholesterol has which of the following effects on the plasma membrane of an animal cell? it makes the membrane more rigid at low temperatures, and more fluid at high temperatures it makes the membrane more rigid at both low temperatures and high temperatures it makes the membrane more fluid at high temperatures, and more rigid at low temperatures it makes the membrane more fluid at both high temperatures and low temperatures it makes the membrane more fluid at low temperatures, and more rigid at high temperaturesarrow_forwardCalcium is a mineral needed by the body to strengthen the bones and for muscular contraction. If the concentration of calcium inside a cell is 0.3% while that of the surrounding fluid is 0.1%, how can the cell obtain more calcium?arrow_forwardWhy are glycolipids important in the cell membranes? Group of answer choices Glycolipid helps the cell to provide additional surface area. Glycolipid helps the cell to regulate materials passing through the cell membrane. Glycolipid helps the cell to store sugar molecules Glycolipid helps the cell to recognize other cells of the body.arrow_forward
- List all the cytoplasmic organelles that are composed (at least in part) of lipid-bilayer membranes. Then list all the cytoplasmic organelles that are not membranous.arrow_forwardWhich of the following phospholipid is considered as structural components of nervous tissue? Sphingomyelin Glycerophospholipid Inositol Plasmalogenarrow_forwardAll living organisms, including both bacteria and Eukaryotes have: (Select all that apply Plasma membranes made of phospholipids Robust cytoskeleton, including actin and microtubules D-monosaccharides L-amino acids the ability to extract energy from the environment to do work Ribosomes double stranded DNA Peptidoglycan Nucleiarrow_forward
- Biology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage LearningHuman Biology (MindTap Course List)BiologyISBN:9781305112100Author:Cecie Starr, Beverly McMillanPublisher:Cengage Learning
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College