Bio 253 exam 1 study Questions and Verified
Correct Answers Latest Update 2025-2026
Already Graded
Anatomy -Answer--Structure of the body
Physiology -Answer--function of the body
Homeostasis -Answer--Maintenance of stable internal environment.
positive feedback loop. -Answer--Enhances change in a system. (Child birth,
contractions)
Negative Feedback Loop. -Answer--Reduces change to maintain stability. (Blood
pressure, glucose have to do intervention)
Element -Answer--Matter with specific chemical properties.
Atom -Answer--Smallest unit of an element with chemical properties.
Atomic Structure -Answer--Protons and neutrons in nucleus; electrons orbit.
Ionic Bond -Answer--Electrical attraction between oppositely charged ions.
Covalent Bond -Answer--Sharing of electrons between atoms.
Hydrogen Bond -Answer--Weak bond between polar molecules.
pH Scale -Answer--Measures acidity or alkalinity of a solution.
Acids -Answer--Substances that donate protons in solution.
Bases -Answer--Substances that accept protons in solution.
Carbohydrates -Answer--Organic compounds primarily used for energy.
, Lipids -Answer--Nonpolar molecules, essential for energy storage.
Proteins -Answer--Polymers of amino acids performing various functions.
Nucleic Acids -Answer--Molecules made of nucleotides; DNA and RNA.
Cell Membrane -Answer--Barrier made of lipid bilayer and proteins.
Cytoplasm -Answer--Fluid within cells containing organelles.
Mitochondria -Answer--Organelles that produce ATP through respiration.
Microvilli -Answer--Cell extensions that increase surface area.
Cilia -Answer--Hair-like structures that aid in movement.
Flagella -Answer--Long whip-like structures for cell motility.
Passive Transport -Answer--Movement across membrane without energy use.
Simple Diffusion -Answer--Movement of molecules from high to low concentration.
Facilitated Diffusion -Answer--Transport via proteins without ATP usage.
Osmosis -Answer--Water diffusion across a semipermeable membrane.
Tonicity -Answer--Effect of solution concentration on cell volume.
Isotonic Solution -Answer--Equal concentration inside and outside the cell.
Hypertonic Solution -Answer--Higher concentration outside, causes cell shrinkage.
Hypotonic Solution -Answer--Lower concentration outside, causes cell swelling.
Filtration -Answer--Movement of water and solutes through a membrane.
Active Transport -Answer--Energy-requiring movement against concentration
gradient.
Ion Pumps -Answer--Transport proteins that move ions across membranes.
Exocytosis -Answer--Process of expelling materials from a cell.
Correct Answers Latest Update 2025-2026
Already Graded
Anatomy -Answer--Structure of the body
Physiology -Answer--function of the body
Homeostasis -Answer--Maintenance of stable internal environment.
positive feedback loop. -Answer--Enhances change in a system. (Child birth,
contractions)
Negative Feedback Loop. -Answer--Reduces change to maintain stability. (Blood
pressure, glucose have to do intervention)
Element -Answer--Matter with specific chemical properties.
Atom -Answer--Smallest unit of an element with chemical properties.
Atomic Structure -Answer--Protons and neutrons in nucleus; electrons orbit.
Ionic Bond -Answer--Electrical attraction between oppositely charged ions.
Covalent Bond -Answer--Sharing of electrons between atoms.
Hydrogen Bond -Answer--Weak bond between polar molecules.
pH Scale -Answer--Measures acidity or alkalinity of a solution.
Acids -Answer--Substances that donate protons in solution.
Bases -Answer--Substances that accept protons in solution.
Carbohydrates -Answer--Organic compounds primarily used for energy.
, Lipids -Answer--Nonpolar molecules, essential for energy storage.
Proteins -Answer--Polymers of amino acids performing various functions.
Nucleic Acids -Answer--Molecules made of nucleotides; DNA and RNA.
Cell Membrane -Answer--Barrier made of lipid bilayer and proteins.
Cytoplasm -Answer--Fluid within cells containing organelles.
Mitochondria -Answer--Organelles that produce ATP through respiration.
Microvilli -Answer--Cell extensions that increase surface area.
Cilia -Answer--Hair-like structures that aid in movement.
Flagella -Answer--Long whip-like structures for cell motility.
Passive Transport -Answer--Movement across membrane without energy use.
Simple Diffusion -Answer--Movement of molecules from high to low concentration.
Facilitated Diffusion -Answer--Transport via proteins without ATP usage.
Osmosis -Answer--Water diffusion across a semipermeable membrane.
Tonicity -Answer--Effect of solution concentration on cell volume.
Isotonic Solution -Answer--Equal concentration inside and outside the cell.
Hypertonic Solution -Answer--Higher concentration outside, causes cell shrinkage.
Hypotonic Solution -Answer--Lower concentration outside, causes cell swelling.
Filtration -Answer--Movement of water and solutes through a membrane.
Active Transport -Answer--Energy-requiring movement against concentration
gradient.
Ion Pumps -Answer--Transport proteins that move ions across membranes.
Exocytosis -Answer--Process of expelling materials from a cell.
