Question 1

All of the following are true of the centrioles, except&#10;A)they are located within the centrosome.&#10;B)they are part of the cytoskeleton.&#10;C)they consist of microtubules.&#10;D)they organize the mitotic spindle during cell division.&#10;E)they are nonmembranous organelles.

Accepted Answer

Although the centrioles are part of the centrosome, consisting of microtubules, organizing the mitotic spindle during cell division, and being nonmembranous organelles, they are not part of the cytoskeleton. The cytoskeleton consists of microfilaments, intermediate filaments, and microtubules, whereas centrioles have a specific function in organizing microtubules during cell division.

Question 2

All of the organelles in the cell are membrane-bound.

Accepted Answer

Not all organelles in the cell are membrane-bound; for example, ribosomes are not enclosed by a membrane.

Question 3

The nucleolus is the site of DNA replication.

Accepted Answer

The nucleolus is responsible for producing and processing ribosomal RNA, but not for DNA replication. DNA replication occurs in the nucleus, but not necessarily in the nucleolus.

Question 4

All of the following structures are involved in motility, except&#10;A)microvilli.&#10;B)cilia.&#10;C)microtubules.&#10;D)microfilaments.&#10;E)flagella.

Accepted Answer

Microvilli are finger-like projections on the surface of cells that increase their surface area for absorption and do not have a role in motility. All of the other structures listed are involved in movement or locomotion in cells or organisms.

Question 5

The rough endoplasmic reticulum is a group of flattened sacs that packages glycoproteins to be transported around the cell or excreted.

Accepted Answer

The rough endoplasmic reticulum is involved in the synthesis of proteins, particularly those that will be secreted from the cell or inserted into cellular membranes. It is the Golgi apparatus that modifies, sorts, and packages proteins for secretion or for use within the cell.

Question 6

The plasma membrane of a cell can also be called the cell membrane.

Accepted Answer

The plasma membrane and the cell membrane are used interchangeably to refer to the same structure, which encloses the cytoplasm and organelles within a cell and regulates the flow of materials in and out of the cell.

Question 7

All of the following are true of the plasma membrane, except&#10;A)it is mainly composed of a phospholipid bilayer.&#10;B)it is selectively permeable to various substances, controlling which substances can cross the membrane.&#10;C)the glycocalyx provides structural integrity to the plasma membrane.&#10;D)transmembrane proteins may function as ion channels, enzymes, or receptors.&#10;E)charged or large molecules can sometimes enter a cell via membrane proteins.

Accepted Answer

The glycocalyx on the plasma membrane does not provide structural integrity, but rather acts as a cell's "ID card," allowing cells to recognize one another and communicate. The phospholipid bilayer, selective permeability, and functions of transmembrane proteins are all characteristics of the plasma membrane. Additionally, charged or large molecules can enter a cell via membrane proteins such as ion channels or transporters.

Question 8

The cytosol and cytoplasmic organelles are components of the ________.&#10;A)cytoskeleton&#10;B)cytoplasm&#10;C)mitochondria&#10;D)nucleus&#10;E)plasma membrane

Accepted Answer

The cytosol and cytoplasmic organelles are both part of the cytoplasm, which refers to the entire contents of the cell outside of the nucleus. Therefore, the best choice is B, cytoplasm.

Question 9

All of the following structures are found in (or surrounding)the nucleus of a cell, except the ________.&#10;A)centrioles&#10;B)chromatin&#10;C)nucleolus&#10;D)nuclear envelope&#10;E)nuclear pores

Accepted Answer

Centrioles are not found within the nucleus or its surroundings. They are typically found outside the nucleus in the cytoplasm of animal cells, playing an important role in cell division.

Question 10

Which of the following organelles are sometimes called &#34;suicide sacs,&#34; because they are able to destroy the whole cell?&#10;A)Ribosomes&#10;B)Golgi apparatus&#10;C)Lysosomes&#10;D)Mitochondria&#10;E)Centrioles

Accepted Answer

Lysosomes are sometimes called "suicide sacs" because they contain digestive enzymes that are capable of breaking down cellular components and even the entire cell itself. In some situations, lysosomes can rupture and release their contents, leading to cell death.

Question 11

What is the difference in function between the smooth and rough endoplasmic reticulum (ER)?&#10;A)The rough ER produces ATP, while the smooth ER does not.&#10;B)The rough ER helps with cellular movements, while the smooth ER does not.&#10;C)The rough ER conducts lipid synthesis, while the smooth ER conducts protein synthesis.&#10;D)The rough ER breaks down lipids, while the smooth ER breaks down proteins and debris.&#10;E)The rough ER conducts protein synthesis, while the smooth ER conducts lipid synthesis.

Accepted Answer

The answer of What is the difference in function between...

Question 12

The nuclear envelope is a double-layered membrane, like the plasma membrane.

Accepted Answer

The answer of The nuclear envelope is a double-layered membrane,...

Question 13

Which of the following organelles provide additional surface area for absorption?&#10;A)Cilia&#10;B)Microvilli&#10;C)Ribosomes&#10;D)Flagella&#10;E)Centrioles

Accepted Answer

The answer of Which of the following organelles provide additional...

Question 14

Which of the following organelles is sometimes called the powerhouse of the cell, because of its role in ATP production?&#10;A)Golgi apparatus&#10;B)Centrosome&#10;C)Lysosomes&#10;D)Mitochondria&#10;E)Peroxisomes

Accepted Answer

The answer of Which of the following organelles is sometimes...

Question 15

What do lysosomes and peroxisomes have in common?&#10;A)They both have specific roles in cell division&#10;B)They are both involved in ATP production for the cell.&#10;C)They are both vesicles (sacs)of enzymes.&#10;D)They both produce proteins for the cell.&#10;E)They are both part of the cytoskeleton.

Accepted Answer

The answer of What do lysosomes and peroxisomes have in...

Question 16

The best way to observe cheek cells is under a dissecting microscope; they are too large to view under a compound light microscope.

Accepted Answer

The answer of The best way to observe cheek cells...

Deck 5: Cell Structure and Function