What is the primary function of the cell membrane?

UIL Biology Topic 1 Flashcards

Flashcard
•
Biology
•
12th Grade
•
Hard
Joseph Peck
FREE Resource
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50 questions
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1.
FLASHCARD QUESTION
Front
Back
Regulating entry and exit of substances
Answer explanation
The primary function of the cell membrane is regulating entry and exit of substances, allowing cells to maintain homeostasis by controlling what enters and leaves, unlike the other options which pertain to different cellular functions.
2.
FLASHCARD QUESTION
Front
Which macromolecule is the main component of cell membranes? Options: Carbohydrates, Proteins, Lipids, Nucleic acids, Vitamins
Back
Lipids
Answer explanation
Lipids are the main component of cell membranes, forming a bilayer that provides structure and regulates the movement of substances in and out of the cell. Other macromolecules play different roles but do not primarily compose membranes.
3.
FLASHCARD QUESTION
Front
Which type of transport does not require cellular energy? Options: Active transport, Endocytosis, Exocytosis, Facilitated diffusion, Phagocytosis
Back
Facilitated diffusion
Answer explanation
Facilitated diffusion is a passive transport process that allows substances to cross membranes without the use of cellular energy, unlike active transport, endocytosis, exocytosis, and phagocytosis, which all require energy.
4.
FLASHCARD QUESTION
Front
What is a carbohydrate's primary role?
Back
Energy supply
Answer explanation
Carbohydrates primarily serve as an energy supply for the body. They are broken down into glucose, which is used for immediate energy or stored for later use, making this option the best description of their primary role.
5.
FLASHCARD QUESTION
Front
Characteristic of enzymes:
- They are consumed in reactions
- They are lipids
- They increase activation energy
- They speed up chemical reactions
- They are nucleic acids
Back
They speed up chemical reactions
Answer explanation
Enzymes are biological catalysts that speed up chemical reactions by lowering the activation energy required. They are not consumed in the reactions, nor are they lipids or nucleic acids.
6.
FLASHCARD QUESTION
Front
Which structure within the cell is responsible for producing ATP?
Back
Mitochondria
Answer explanation
The mitochondria are known as the powerhouse of the cell, as they are responsible for producing ATP (adenosine triphosphate), the main energy currency of the cell, through cellular respiration.
7.
FLASHCARD QUESTION
Front
What is the role of ribosomes in the cell?
Back
Protein synthesis
Answer explanation
Ribosomes are essential for protein synthesis, as they translate messenger RNA (mRNA) into amino acid sequences, forming proteins. This process is crucial for cell function and growth, making 'Protein synthesis' the correct answer.
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