BIOS 251 Week 3 Virtual Discussion; Cell Structures & Transport
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Week 3: Virtual Discussion Angel Winstead Chamberlain University College of Nursing BIOS 251: Anatomy & Physiology Professor Humayun 11/10/2025 All cells share four common structures. List and describe these four structures. Plasma Membrane- a system of proteins and lipids that create a boundary around the cell to regulate entry and exit of certain materials. It allots structural support for the cell. (Edapt.ai. (n.d.).) Cytoplasm- “refers to the fluid that fills the cell, which includes the cytosol along with filaments, proteins, ions and macromolecular structures as well as the organelles suspended in the cytosol.” (Biology Dictionary 2017) DNA (Deoxyribonucleic acid)- genetic material that carries the instructions for all cellular structures. Located in the nucleus which is a large organelle that stores DNA. Ribosomes- small structure that are responsible protein synthesis within the cell. RNA (ribonucleic acid) gives instructions for protein synthesis. Explain the difference between passive transport and active transport. Passive transport is the movement of molecules across a cell membrane without the use of cellular energy. This means that the substances from a high concentration gradient to low concentration gradient. Active transport requires the use of energy to move substances against their concentration gradient, meaning it goes from a low concentration gradient to a high concentration gradient. It uses ATP and carri
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