Human Biology and Cells

Last updated 8 months ago

48 questions

Library

Human Biology and Cells

Last updated 8 months ago

48 questions

1

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Match the cell components with their descriptions:

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		Outer barrier regulating what enters/exits
		Semi-fluid portion containing organelles
Organelles		Control center directing cellular activities
Cytoplasm		Specialized structures with specific functions

Which functions are performed by the cell membrane?

What is the main role of surface proteins in the cell membrane?

Creating energy for the cell

Transporting molecules across the membrane

Defining cell shape only

Support, communication, and cellular structure

Which type of protein spans both sides of the cell membrane?

Surface proteins

Transport channels only

Globular proteins

Surface markers

What do transport channels primarily do in the cell membrane?

Facilitate movement of molecules

Act as surface markers

Provide structural support

Store genetic information

What are surface markers composed of?

Hydrophobic lipids

Phospholipid bilayers

Proteins embedded in membranes

Chains of carbohydrates

Why are surface markers important to the immune system?

Create energy for cells

Support cell division

Indicate cell belongs to the body

Transport nutrients

What does selective permeability allow in a cell membrane?

All substances to pass through easily.

It prevents any substances from entering.

Specific substances to pass while restricting others.

Only small molecules can enter.

Which term describes movement from low to high concentration?

Diffusion is based on concentration only.

Active transport requires energy for movement.

Passive transport occurs without energy.

All movement requires energy to occur.

What role do membrane proteins play in selective permeability?

They block all substances from entering.

They make the membrane completely impermeable.

They are not involved in transport processes.

They regulate what can enter or leave the cell.

Which process does not require cellular energy?

Exocytosis expels materials with energy.

Passive transport happens without energy input.

Endocytosis requires energy to engulf substances.

Active transport uses energy to move molecules.

What type of molecules pass through the lipid bilayer most easily?

Large, charged ions

Small, polar molecules like glucose

Small, non-polar molecules like oxygen

Large, uncharged polar molecules

Why are ions unable to pass through the lipid bilayer freely?

They are repelled by the hydrophobic lipids

They are large and charged

They are too small to fit

They need energy to move

What characteristic do small, uncharged polar molecules share?

They cannot cross the membrane

They need transport proteins

They are fully impermeable

They can pass the membrane via diffusion

What percentage of total body weight does intracellular fluid constitute?

20%

60%

40%

80%

Where is extracellular fluid primarily located?

Only in blood

In cell membranes

Inside cells

Outside of cells

How do intracellular fluids typically respond to changes?

They mix with extracellular fluid

They change rapidly

They evaporate quickly

They are stable and do not readily change

What describes diffusion in cellular processes?

Use of energy from ATP

Movement of large molecules only

Movement against concentration gradient

Movement from high to low concentration

What is osmosis specifically involved in?

Diffusion of water across a membrane

Protein transport in cells

Movement of glucose into cells

Transport of ions against gradient

Which process involves protein assistance during transport?

Diffusion through lipid bilayer

Active transport

Facilitated diffusion

Simple diffusion

How is filtration different from other processes?

Diffusion of oxygen only

Pressure-driven movement through a membrane

Active transport using ATP

Involves ion channels

What is the process of expelling substances from a cell?

Exocytosis

Osmosis

Endocytosis

Phagocytosis

What describes the process of engulfing particles?

Facilitated Diffusion

Exocytosis

Pinocytosis

Phagocytosis

Which process requires energy input from the cell?

Simple diffusion

Passive transport

Facilitated diffusion

Both exocytosis and endocytosis

What primarily powers the sodium-potassium pump?

Diffusion gradient

ATP energy

Passive transport

Electrical charge

Which ions does the sodium-potassium pump transport?

Glucose and amino acids

Water and oxygen

Sodium and potassium ions

Calcium and magnesium

How does the sodium-potassium pump move ions?

With the concentration gradient

Against their concentration gradient

Via passive diffusion

Through osmosis

What is the main function of the sodium-potassium pump?

Store energy in ATP

Transport nutrients into the cell

Facilitate cell division

Maintain cell membrane potential

What are the main components of DNA and RNA?

Amino acids and proteins, which are unrelated.

Nucleotides, which include sugar, phosphate, and bases.

Only sugars and phosphates, missing bases.

Lipids and carbohydrates, which aren't involved here.

How does DNA differ from RNA structurally?

DNA is double-stranded; RNA is single-stranded.

DNA has no role in genetic information.

Both are single-stranded with no differences.

DNA lacks a helical structure, RNA is helical.

Why is DNA replication important for cells?

It ensures genetic information is passed during division.

Only RNA needs to replicate for genes.

It is unnecessary for cell survival.

It prevents mutations in all circumstances.

What is a unique feature of RNA compared to DNA?

RNA is double-stranded like DNA.

RNA does not transmit genetic information.

RNA has more nucleobases than DNA.

RNA contains uracil instead of thymine found in DNA.

What is the function of the nucleolus?

Produces proteins in the cytoplasm.

Transports RNA outside the nucleus.

Breaks down waste in the cell.

Storage of unused DNA within the nucleus.

What do genes provide instructions for?

Coding for specific proteins in the cell.

Storage of chromatin in the cytoplasm.

Formation of the nuclear envelope.

Replication of the nucleus.

What is chromatin made of?

Liquid found inside the nucleus.

Only RNA and proteins.

Entirely made of lipids.

Thread-like DNA wrapped around proteins.

What do chromosomes contain?

Free-floating proteins in the cytoplasm.

Unused DNA not related to genes.

Condensed chromatin that holds genes.

Only RNA strands from the nucleolus.

What is the main function of the Rough ER?

Lipid synthesis without ribosomes.

Transporting DNA within the cell.

Protein synthesis via ribosomes.

Detoxification of harmful substances.

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Match the cell components with their descriptions:

Outer barrier regulating what enters/exits

Semi-fluid portion containing organelles

Organelles

Control center directing cellular activities

Cytoplasm

Specialized structures with specific functions

Which functions are performed by the cell membrane?

Forms cell boundary

Provides energy to the cell

Stores genetic material

Regulates substance movement

Provides cell identification

What is the main role of surface proteins in the cell membrane?

Creating energy for the cell

Transporting molecules across the membrane

Defining cell shape only

Support, communication, and cellular structure

Which type of protein spans both sides of the cell membrane?

Surface proteins

Transport channels only

Globular proteins

Surface markers

What do transport channels primarily do in the cell membrane?

Facilitate movement of molecules

Act as surface markers

Provide structural support

Store genetic information

What are surface markers composed of?

Hydrophobic lipids

Phospholipid bilayers

Proteins embedded in membranes

Chains of carbohydrates

Why are surface markers important to the immune system?

Create energy for cells

Support cell division

Indicate cell belongs to the body

Transport nutrients

What does selective permeability allow in a cell membrane?

All substances to pass through easily.

It prevents any substances from entering.

Specific substances to pass while restricting others.

Only small molecules can enter.

Which term describes movement from low to high concentration?

Diffusion is based on concentration only.

Active transport requires energy for movement.

Passive transport occurs without energy.

All movement requires energy to occur.

What role do membrane proteins play in selective permeability?

They block all substances from entering.

They make the membrane completely impermeable.

They are not involved in transport processes.

They regulate what can enter or leave the cell.

Which process does not require cellular energy?

Exocytosis expels materials with energy.

Passive transport happens without energy input.

Endocytosis requires energy to engulf substances.

Active transport uses energy to move molecules.

What type of molecules pass through the lipid bilayer most easily?

Large, charged ions

Small, polar molecules like glucose

Small, non-polar molecules like oxygen

Large, uncharged polar molecules

Why are ions unable to pass through the lipid bilayer freely?

They are repelled by the hydrophobic lipids

They are large and charged

They are too small to fit

They need energy to move

What characteristic do small, uncharged polar molecules share?

They cannot cross the membrane

They need transport proteins

They are fully impermeable

They can pass the membrane via diffusion

What percentage of total body weight does intracellular fluid constitute?

20%

60%

40%

80%

Where is extracellular fluid primarily located?

Only in blood

In cell membranes

Inside cells

Outside of cells

How do intracellular fluids typically respond to changes?

They mix with extracellular fluid

They change rapidly

They evaporate quickly

They are stable and do not readily change

What describes diffusion in cellular processes?

Use of energy from ATP

Movement of large molecules only

Movement against concentration gradient

Movement from high to low concentration

What is osmosis specifically involved in?

Diffusion of water across a membrane

Protein transport in cells

Movement of glucose into cells

Transport of ions against gradient

Which process involves protein assistance during transport?

Diffusion through lipid bilayer

Active transport

Facilitated diffusion

Simple diffusion

How is filtration different from other processes?

Diffusion of oxygen only

Pressure-driven movement through a membrane

Active transport using ATP

Involves ion channels

What is the process of expelling substances from a cell?

Exocytosis

Osmosis

Endocytosis

Phagocytosis

What describes the process of engulfing particles?

Facilitated Diffusion

Exocytosis

Pinocytosis

Phagocytosis

Which process requires energy input from the cell?

Simple diffusion

Passive transport

Facilitated diffusion

Both exocytosis and endocytosis

What primarily powers the sodium-potassium pump?

Diffusion gradient

ATP energy

Passive transport

Electrical charge

Which ions does the sodium-potassium pump transport?

Glucose and amino acids

Water and oxygen

Sodium and potassium ions

Calcium and magnesium

How does the sodium-potassium pump move ions?

With the concentration gradient

Against their concentration gradient

Via passive diffusion

Through osmosis

What is the main function of the sodium-potassium pump?

Store energy in ATP

Transport nutrients into the cell

Facilitate cell division

Maintain cell membrane potential

What are the main components of DNA and RNA?

Amino acids and proteins, which are unrelated.

Nucleotides, which include sugar, phosphate, and bases.

Only sugars and phosphates, missing bases.

Lipids and carbohydrates, which aren't involved here.

How does DNA differ from RNA structurally?

DNA is double-stranded; RNA is single-stranded.

DNA has no role in genetic information.

Both are single-stranded with no differences.

DNA lacks a helical structure, RNA is helical.

Why is DNA replication important for cells?

It ensures genetic information is passed during division.

Only RNA needs to replicate for genes.

It is unnecessary for cell survival.

It prevents mutations in all circumstances.

What is a unique feature of RNA compared to DNA?

RNA is double-stranded like DNA.

RNA does not transmit genetic information.

RNA has more nucleobases than DNA.

RNA contains uracil instead of thymine found in DNA.

What is the function of the nucleolus?

Produces proteins in the cytoplasm.

Transports RNA outside the nucleus.

Breaks down waste in the cell.

Storage of unused DNA within the nucleus.

What do genes provide instructions for?

Coding for specific proteins in the cell.

Storage of chromatin in the cytoplasm.

Formation of the nuclear envelope.

Replication of the nucleus.

What is chromatin made of?

Liquid found inside the nucleus.

Only RNA and proteins.

Entirely made of lipids.

Thread-like DNA wrapped around proteins.

What do chromosomes contain?

Free-floating proteins in the cytoplasm.

Unused DNA not related to genes.

Condensed chromatin that holds genes.

Only RNA strands from the nucleolus.

What is the main function of the Rough ER?

Lipid synthesis without ribosomes.

Transporting DNA within the cell.

Protein synthesis via ribosomes.

Detoxification of harmful substances.

What role does the Smooth ER play in a cell?

Storing genetic information in ribosomes.

Transporting oxygen throughout the cell.

Protein production for cell growth.

Synthesis of lipids and detoxification processes.

What primary role does the Golgi complex serve in cells?

Stores genetic information

Produces energy for cells

Breaks down waste materials

Processes and delivers proteins

Why are mitochondria referred to as the powerhouse of the cell?

They produce ATP through respiration

They transport materials within cells

They package proteins for delivery

They store nutrients for cells

What is the primary function of cilia in cells?

Cell locomotion

Moving substances along the cell surface.

Increasing cell size

Absorbing nutrients

How do microvilli enhance a cell's absorption ability?

By storing waste

By moving the cell

By creating energy

By increasing surface area for absorption.

What distinguishes flagella from cilia?

Cilia are for energy

Flagella are for absorption

Cilia are used for growth

Flagella are longer and whip-like in structure.

What is the primary purpose of mitosis?

To reduce chromosome number

To form gametes

To divide cytoplasm only

Division of body cells

How does meiosis differ from mitosis?

Maintains chromosome number

Occurs in all somatic cells

Divides cytoplasm only

Reduces chromosome number

Match each tissue type to its primary function.

Connective

Transmits and interprets nerve impulses

Epithelial

Produces movement through force generation

Nervous

Covers surfaces, lines cavities

Muscle

Supports and binds organs together

Match the membrane type with its description.

Cutaneous membrane

Covers organs within closed cavities

Mucous membrane

Protects against UV light and microbes

Synovial membrane

Lines cavities opening to exterior

Serous membrane

Lines freely movable joints

Match the membrane type with its location.

Cutaneous membrane

Located in respiratory and digestive tracts

Mucous membrane

Lines freely movable joints

Synovial membrane

Found in skin and outer layer