#1
What is the primary function of the cell membrane?
Energy production
Cellular respiration
Selective permeability
DNA replication
#2
Which of the following is a characteristic of facilitated diffusion?
Requires energy input
Moves against the concentration gradient
Involves transport proteins
Occurs through simple diffusion
#3
In which phase of the cell cycle does DNA replication occur?
G1 phase
S phase
G2 phase
M phase
#4
Which type of cellular transport is responsible for the movement of water across a selectively permeable membrane?
Active transport
Facilitated diffusion
Osmosis
Exocytosis
#5
What is the primary function of aquaporins in cellular transport?
Facilitate the movement of ions
Facilitate the movement of water
Facilitate the movement of gases
Facilitate the movement of large molecules
#6
Which organelle is responsible for the production of ATP?
Golgi apparatus
Endoplasmic reticulum
Mitochondrion
Nucleus
#7
In which cellular transport process do cells engulf large particles by wrapping the cell membrane around them?
Diffusion
Osmosis
Exocytosis
Endocytosis
#8
What is the main function of the sodium-potassium pump in cellular transport?
Maintaining membrane integrity
Maintaining membrane potential
Facilitating active transport
Controlling cellular respiration
#9
Which type of cell junction allows the direct passage of ions and small molecules between adjacent cells?
Desmosomes
Tight junctions
Gap junctions
Adherens junctions
#10
What is the function of the smooth endoplasmic reticulum in a cell?
Protein synthesis
Lipid synthesis and detoxification
Energy production
Ribosome assembly
#11
What is the primary purpose of signal transduction in cell communication?
Energy production
Cellular respiration
Amplifying and transmitting signals
DNA replication
#12
Which of the following is an example of paracrine signaling?
Neurotransmission
Hormonal signaling
Cell-to-cell contact
Local signaling within tissues
#13
What is the role of second messengers in cell signaling pathways?
Initiate the signal cascade
Amplify and transmit signals
Terminate signal transduction
Activate the receptor proteins
#14
What is the role of the Golgi apparatus in cellular transport?
Protein synthesis
Lipid synthesis
Modification and packaging of proteins
Energy production
#15
Which type of cell signaling involves the release of signaling molecules into the bloodstream to reach distant target cells?
Autocrine signaling
Paracrine signaling
Endocrine signaling
Juxtacrine signaling