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Chapter 4: Problem 12

No animal cell has a _______ a. plasma membrane b. flagellum c. lysosome d. cell wall

Short Answer

Expert verified
Animal cells do not have a cell wall.

Step by step solution

01

Understanding Cell Structure

First, let's understand the basic components of an animal cell. An animal cell typically has a plasma membrane, which is a protective barrier that surrounds the cell, lysosomes, which are involved in waste processing, and sometimes flagella, which are used for movement.
02

Understanding Plant Cell Structure

In contrast to animal cells, plant cells have a cell wall in addition to the plasma membrane for extra support and structure. The cell wall is not found in animal cells, but it is a key component of plant cells.
03

Identifying the Missing Component

Since the question asks us for something that is found in plant cells but not in animal cells, and understanding that only plant cells have a cell wall, our missing component in animal cells is the cell wall.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Plasma Membrane
The plasma membrane is a vital structure in animal cells. It acts like a flexible barrier, wrapping around the cell, controlling what enters and exits. This membrane is composed of a thin layer of lipids and proteins. These components create a semi-permeable membrane, which means it allows some substances to pass while blocking others.
The plasma membrane鈥檚 main functions include:
  • Protecting the cell from its environment
  • Facilitating communication with other cells
  • Transporting nutrients and waste
Without a plasma membrane, the cell would be vulnerable to its surroundings. This makes it crucial for the cell's survival and proper functioning.
Cell Wall
Animal cells, unlike plant cells, do not have a cell wall. The cell wall is an additional layer that provides stability and support to plant cells. Made primarily of cellulose, the cell wall is rigid and gives plant cells their distinct rectangular shape.
Here are some functions of the cell wall in plant cells:
  • Provides structural strength
  • Prevents excessive water intake
  • Helps plants stand upright without bones
The absence of a cell wall in animal cells allows for a wider variety of shapes and higher mobility, which are advantages for animals that rely on movement.
Lysosomes
Lysosomes are essential components of animal cells, often described as the cell鈥檚 waste disposal system. These small, spherical organelles contain enzymes that break down waste materials and cellular debris. They are enclosed by a membrane to prevent the enzymes from leaking into the cell, where they might cause harm.
The functions of lysosomes include:
  • Digesting excess or worn-out organelles
  • Breaking down macromolecules like proteins, lipids, and carbohydrates
  • Fighting off invading viruses and bacteria
Without lysosomes, cells would accumulate waste and become dysfunctional. Thus, they play a vital role in maintaining the cell's health and overall efficiency.

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Most popular questions from this chapter

All cells have these three things in common:_______ a. cytoplasm, DNA, and organelles with membranes b. a plasma membrane, DNA, and a nuclear envelope c. cytoplasm, DNA, and a plasma membrane d. a cell wall, cytoplasm, and DNA

Which of the following statements is correct? a. Ribosomes are only found in bacteria and archaea. b. Some animal cells are prokaryotic. c. Only eukaryotic cells have mitochondria. d. The plasma membrane is the outermost boundary of all cells. e. Some cell membranes do not consist of lipids.

Enzymes contained in _______ break down worn-out organelles, bacteria, and other particles. a. plasma membrane b. Golgi bodies c. endoplasmic reticulum d. peroxisomes

Match each cell component with its function. $$ \text { mitochondrion} \quad \quad\quad\quad\quad \text {a. connection} $$ $$ \text { chloroplast} \quad \quad\quad\quad\quad \text {b. protective covering} $$ $$ \text {ribosome} \quad \quad\quad\quad\quad \text {c. ATP production} $$ $$ \text { nucleus} \quad \quad\quad\quad\quad \text {d. protects DNA} $$ $$ \text {cell junction} \quad \quad\quad\quad\quad \text {e. protein synthesis} $$ $$ \text {flagellum } \quad \quad\quad\quad\quad \text {f. photosynthesis} $$ $$ \text { cuticle} \quad \quad\quad\quad\quad \text { g. movement } $$

In a lipid bilayer, the ______________ of all the lipid molecules are sandwiched between all of the _______ a. hydrophilic tails; hydrophobic heads b. hydrophilic heads; hydrophilic tails c. hydrophobic tails; hydrophilic heads d. hydrophobic heads; hydrophilic tails
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