3.1-Homeostasis and Cellular Transport

Which mechanism helps an organism maintain stable internal conditions despite environmental changes?

• Mitosis
• Homeostasis
• Photosynthesis
• Cellular respiration

In a negative feedback mechanism, what is the primary goal of the system's response?

• Amplify the initial change
• Return to a set point
• Completely eliminate the stimulus
• Increase system variability

Which type of transport requires cellular energy to move molecules against their concentration gradient?

• Diffusion
• Osmosis
• Active transport
• Facilitated diffusion

The plasma membrane's structure is best described as a:

• Rigid crystal lattice
• Phospholipid bilayer with embedded proteins
• Solid metal sheet
• Completely fluid liquid

Which process involves a cell engulfing large particles by forming vesicles?

• Exocytosis
• Diffusion
• Endocytosis
• Osmosis

In the cause and effect model of homeostasis, what role does the 'control center' play?

• Detecting the initial stimulus
• Implementing the final response
• Processing and deciding on the appropriate response
• Generating new stimuli

Which transport mechanism moves water across a semi-permeable membrane?

• Active transport
• Facilitated diffusion
• Osmosis
• Exocytosis

A positive feedback mechanism is characterized by:

• Returning to a stable state
• Amplifying the initial change
• Maintaining constant conditions
• Reducing system sensitivity

Which cellular transport method moves molecules from high to low concentration without using energy?

• Active transport
• Endocytosis
• Diffusion
• Exocytosis

In the body temperature regulation example, which organ acts as the primary sensor?

• Liver
• Hypothalamus
• Kidney
• Pancreas