Exam 1 Flashcards
Eukaryotes are the cells of which types of organisms?
Eukaryotes are the cells of which types of organisms?
__________ cells are larger and have membrane-bound organelles and a well-defined nucleus.
Eukaryote
The eukaryotic cell consists of three general components:
The plasma membrane, the cytoplasm, and the intracellular organelles
The ________ is the largest membrane-bound organelle and is found in cells center
Nucleus
The chief function of the nucleus are:
Cell division and control of genetic information
_________ is an aqueous solution that fills the space between the nucleus and the plasma membrane
Cytoplasm (cytosol)
_________ are suspended in the cytoplasm and are enclosed in biologic mmebranes
The organelles
________ are RNA-protein complexes that provide sites for cellular protein synthesis
Ribosomes
_________ specializes in synthesis, folding and transport and lipid components of most of the organelles and sensing stress in cells
Smooth endoplasmic reticulum
Stack of small sacs formed by membranes inside the cells cytoplasm
Golgi Complex
Responsible for processing and packaging proteins into secretory vesicles that migrate to ICF and ECF, including plasma membrane
Golgi complex
Saclife structures that contain digestive enzymes
Lysosome
These enzymes are responsible for digesting most cellular substances to their basic form
Lysosomes
The movement of a solute from an area of a greater concentration area to area of lesser concentration is known as?
Diffusion (a type of passive transport)
The movement of water solutes through a membrane because of a greater pressure pushing on the other side
Filtration
The force of water pushing against a cellular membrane
Hydrostatic pressure
The movement of water accross a semipermeable membrane from a region of lower solute concentration to a region of higher solute concentration
Osmosis
The amount of hydrostatic pressure required to oppose the osmotic movement of water is called
The osmotic pressure of solution
What type of transport requires expenditure of metabolic energy by the cell’s means of ATP?
Active transport
Sodium and ________ are found in virtually all cells
potassium
The largest molecules (macromolecules) and fluids are transported by membrane-bound vesicles through the process of __________(ingestion) and _______(expulsion)
Endocytosis and exocytosis
In simple diffusion only tiny, NON-CHARGED MOLECULES, are going to be able to go straight through such as:
oxygen, carbon dioxide
In ___________ diffusion allows, larger charged molecules such as glucose
Facilitated Diffusion
Goal of osmosis is to
Achieve homeostasis with respect to water
The basic structure of the plasma membrane is the __________
Lipid bilayer
The _______ determines the structure of the membrane
Lipid bilayer
Each lipid molecule is polar; or amphipathic: the head is ____________ and the tail is__________
Each lipid molecule is polar; or amphipathic: the head is hydrophillic (water loving) and the tail is hydrophobic (water hating)
__________ determine the functions of the membrane
Proteins determine the functions of the membrane
_____________ perform most of the plasma membrane’s tasks
Proteins perform most of the plasma membrane’s tasks
____________ act as recognition and binding units for substances moving in and out of the cell pores and transport channels, enzymes that drive pimps or maintain ion concentrations, cell surface markers, cell adhesion molecules, and catalysts of chemical reactions
Proteins act as recognition and binding units for substances moving in and out of the cell pores and transport channels, enzymes that drive pimps or maintain ion concentrations, cell surface markers, cell adhesion molecules, and catalysts of chemical reactions
Proteins form cellular receptors that recognize and bind with smaller molecules called ________
Ligands
________ is the state of cell balance of the processes of protein synthesis, folding and dehydration (protein homeostasis)
Proteostasis
Carbohydrates on the outside of the plasma membrane form a coating that protects the cell from mechanical damage and creates a slimy surface that assists in mobility. T/F?
True
Carbohydrates function in _______ to ______ recognition and adhesion
cell to cell
A cellular function that occurs in all cell types is
Metabolic absorption
Movement is performed by what type of cell
muscle cells
All cells can reproduce and have continuous division. T/f?
F. Reproduction, or continuous division is not a function all cells can perform
RNA protein complexes, sythensized in nucleuous, sites for cellular protein synthesis
Ribosome
Cisternae, Synthesis, folding and transport of proteins and lips
Endoplasmic reticilum
Helps package proteins and export out of cells
Golgi complex
The enzymes of the ________________ , fund in the inner membrane of the mitochondira, gene3rate most of the cell’s ATP
respiratory chain (electron-transport chain)
Amphipathic (hydrophobic and hydrophilic) O2 and CO2 diffusion, barrier to diffusion of water, Molecular glue
Lipids
________ perform most of the plasma membrane tasks
Proteins
The functions of __________ are receptors, transport channel carriers, enzymes, surface markers, cell adhesion, catalysts
proteins
The main goal is to minimize protein misfolding and protein aggregation
Protein regualtion/Preteostasis
Protection, lubrication, recognition, adhesion
Carbohydrates
Bind with cellular receptors to activate or inhibit the receptor’s associates signaling or biochemical pathway
Ligand
Cell to cell adhesions are formed on plasma membranse, thereby allowing the formations of _________ and ________.
Tissue and organs
Cells are held together by three different means. What are they?
- Extracellular membrane
- Cell adhesion molecules in the cell’s plasma membrane
- Specialized cell junctions
The _______________ is secreted by cells and is a meshwork of fibrous proteins in a gel-like substance
Extracellular matrix (ECM)
True or false: The Extracellular matrix (ECM) provides a pathway for the diffusion of nutrients, wastes, and other water-soluble substances
T
The ____________ helps regulate cell growth, movement and differentiation
ECM (extracellular matrix)
The ECM (extracellular matrix) includes three groups of macromolecules: 1 collagen and elastin, 2 adhesive glycoproteins and 3. proteglycans and hyaluronic acid. T/F?
T
_______ is a specialized type of ECM that is very thin, tough, and flexible. It is found under the epithelium. of many organs
Basement membrane
Another name for basil lamina is? Hint: specialized type of ECM
Basement membrane
Cell junctions are he contact between neighboring cells. Hold cells together, provide chemical communication and cell polarity. T/f?
T
Cell junctions can be classified as either __________ or __________
Symmetric or asymmetric
In Cell to cell adhesions, symmetrical cell, junctions are tight junctions-barriers, desmosomes, and belt desmosomes (unit cells) and gab junctions (communication). T or F
T
This process enables uninjured cells to protect themselves from injured neighbors by shutting down communication to stop the spread of disease
Gating
Is the inside of a cell more negatively or positively charged?
Negatively
Cells communicate in three main ways:
(1.) They form protein channels (gap junctions) (2.) They display receptors that affect intracellular processes or other cells in direct physical contact (3.) they use receptor proteins inside the target cell
Paracrine, autocrine, hormonal, neuorhormonal are all primary modes of what?
Intercellular signaling secreted by the cells
If cells are deprived of appropriate signals, cells undergo a form of cell suicide known as programmed death or _____
apoptosis
Functions as an energy transferring molecule and is fuel for cell survivial
ATP
Energy is stored by molecules of:
carbohydrate, lipid, and protein
Digestion, glycolysis and oxidization, and the citric acid cycle are phases of _______
Catabolism
Chemical tasks of maintaining essential cellular functions
Metabolism
Is anabolism energy using or energy releasing?
Energy building, it builds
Is catabolism energy using or energy releasing?
Energy releasing, It breaks down
Is it good to use lipids or proteins to create ATP?
Yes, but it’s not good
Glucose (carbs) and oxygen are the best way to create ____
ATP
_______ is the extracellular breakdown of proteins, fats and carbs
Digestion
___________ is intracellular breakdown of subunits to pyruvate. Breakdown of glycogen into glucose so that we can use them to create ATP
Glycolysis
Four stages of cell cycle
G1 phase, S phase, G2 phase, M=Mitosis
What are the four stages of mitosis?
Remember P-MAT
1. Prohphase
2. Metpahase (m for middle, chromosomes in middle)
3. Anaphase (A for away. Chromosomes start moving away
4. Telophase - Chromosomes all moved on each side, two new nucleus being formed
Metaphase
Metpahase (m for middle, chromosomes in middle)
Anaphase
Anaphase (A for away. Chromosomes start moving away
Telophase
Telophase - Chromosomes all moved on each side, two new nucleus being formed
True or false, only mature cells are capable of division?
True
Maturation of cells occurs during a stage of cellular life known as _________
interphase )growth phase)
Chemical energy is created through
metabolism
__________ is a metabolic pathway that breaks molecules down and releases energy
Catabolism
Cells of one or more types are organized into ___________, and different types of the compose organs
Tissues
Cells of one or more types are organized into tissues, and different types of tissues compose ________
organs
Active transport pushes chemicals against _________
gradient
The two main processes of making energy are
Glycolysis and oxidative phosphorylation
Splits glucose, produces two ATP and two pyruvate molecules. In cytoplasm. One of the two main processes used to make energy
Glycolysis (anaerobic oxygenation)