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Cells and Tissues
What is one function of mitochondria? To:
Produce enzymes to break down molecules
Produce molecules of ATP
Hold adjacent cells together
Allow passage of molecules through the plasma membrane
Mitochondria are organelles within which ATP is made.
Author:
rikazzz
Comment
Cells and Tissues
Facilitated diffusion refers to the process of:
Movement along a concentration gradient assisted by protein carrier molecules
Movement of ions and molecules along a concentration gradient
Transport of molecules and ions against their concentration gradient
Water movement through a semipermeable membrane
Facilitated refers to the role of the protein carriers. The other choices refer to diffusion, active transport and osmosis, respectively.
Author:
rikazzz
Comment
Cells and Tissues
Which one of the following best describes what a cell membrane consists of?
Lipids, proteins, ribosomes
Lipids, cholesterol, proteins
Cholesterol, proteins, cytoplasm
Lipids, proteins, cytoplasm
These are the three major constituents. Ribosomes and cytoplasm are found inside the cell.
Author:
rikazzz
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Cells and Tissues
What is the role of mitochondria? To:
Function in cell division
Synthesise proteins
Form part of the plasma membrane
Synthesise fatty acids, phospholipids and steroids
Mitochondria produce ATP.
Author:
rikazzz
Comment
Cells and Tissues
Which of the base pairings in DNA would be correct?
A – T pair
A – G pair
C – T pair
C – A pair
A pairs with T, while C pairs with G.
Author:
rikazzz
Comment
Cells and Tissues
Which of the following is NOT one of the organelles within a cell?
Desmosome
Endoplasmic reticulum
Mitochondrion
Golgi apparatus
Desmosomes (despite having the suffix “-some”) are not within the cell. They are structures that join adjacent plasma membranes to each other.
Author:
rikazzz
Comment
Cells and Tissues
What do fibroblasts, chondroblasts, osteoblasts and haemocytoblasts have in common?
They are all types of white blood cell.
They are all macrophages.
They are all immature cells.
They are all types of epithelial cell.
The suffix “-blast” implies that these cells have not yet finished their differentiation. That is they are immature.
Author:
rikazzz
Comment
Cells and Tissues
Which of the following cells would be found in nervous tissue?
Dendrocytes
Microglia
Microphages
Erythrocytes
Microglia is a term that refers to the support cells of the nervous system. Dendrocytes are found in the epidermis and there are no erythrocytes in the CNS.
Author:
rikazzz
Comment
Cells and Tissues
Active transport across the plasma membrane may be described by which statement?
Active transport requires energy from ATP.
Active transport is also known as endocytosis.
Active transport moves molecules along their concentration gradient.
Active transport is the movement of lipid-soluble molecules through the plasma membrane.
This is the only correct answer. The others are not true.
Author:
rikazzz
Comment
Cells and Tissues
What is the purpose of mitochondria?
To store the nucleolus and chromatin
To produce adenosine triphosphate
To support and shape the cell
To produce enzymes to break down molecules
Mitochondria are the site of ATP production.
Author:
rikazzz
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