Ch 4 pt 2 Flashcards
What is ligand gated?
Chemical messenger
What structure is polar?
Integral
What structure is nonpolar?
Peripheral
What are glycoproteins?
Proteins and carbohydrate chains
What is integral proteins?
Embedded within the phospholipid bilayer
What is peripheral protein?
Not embedded in lipid bilayer
What is transport proteins?
Regulate movements across membrane
Carriers and channels
Passive transport, no energy, H->L concentration
What are cell surface receptors?
Bind molecules called ligands
Pumps
Active transport, energy,
L->H concentration
What are identity markers?
Communicate to other cells to know they belong in the body
What do enzymes do?
Lower the amount of energy needed
What are enzymes?
Catalyze chemical reactions
Anchoring sites
inside cell
Cell-adhesion proteins
outside the cell
What are pumps purpose?
To restore concentration
Carriers are like what?
Elevators
What does the plasma membrane do?
Regulates movement into and out of a cell
What is passive process?
Does not require energy, H->L concentration
What is active process?
Requires energy, L->H concentration
What is diffusion?
Movement of solutes
What is used in diffusion?
Ions and glucose
What is simple diffusion?
Small and nonpolar solutes, no transport proteins
Rate of diffusion depends on?
Steepness of concentration gradient and temperature.
What is needed for facilitated diffusion?
Transport proteins
What is channel-mediated diffusion?
Ions move through channel
What happens in leak channels?
Always open
What happens in gated channels?
Usually closed
What is voltage gated?
The difference and changes of ions
What is mechanically gated?
Physically touch membrane
What is carrier-mediated diffusion?
Small polar molecules moved by carrier proteins
What is uniporter?
Moving one substance
What is osmosis?
Movement of water
What is aquaporins?
Protein water channels
What are permeable solutes?
Pass through the membrane
What are nonpermeable solutes?
Prevent from passing the membrane
Greater concentration of solutes…
Lower concentration of water
What is tonicity?
Ability to change the volume or pressure of a cell
What is isotonic solution?
Equal concentration on both inside and out
What is hypotonic solution?
Lower concentration of solutes, higher concentration of water
What is cytosol?
Liquid found inside the cell
What is hypertonic?
Higher concentration of solutes, lower concenrtration of water
Primary active transport
Energy source from ATP
What is secondary active transport?
Energy source from kinetic energy
What is symport?
Pumping two materials in same direction
What is antiport?
Pumping two materials in opposite directions
What is exocytosis?
Vesicle releasing contents from a cell
What is vesicular transport?
Moves a lot of things in or out at once
What is endocytosis?
Vesicle formed by bringing in materials into the cell
What is pinocytosis?
Performed by most cells and form multiple small vesicles
What is channel-linked receptors?
Ligands
What is enzymatic receptors?
Active proteins
What is the G-protein kinase enzymes?
Indirectly activate protein kinase enzymes
What is the endoplasmic reticulum?
Membrane of structure
What is the rough ER?
Has ribosomes; important for products of proteins
What is the smooth ER?
Important for lipid synthesis; calcium storage
What is tight junctions?
Strands of proteins linking to prevent passing
What is desmosomes?
Proteins holding onto each other so the epidermic doesn’t fall off
What is gap junctions?
Moving one cell to another
What is the nucleolus?
Composed of proteins and RNA, makes ribosomes
What is the nuclear envelope?
Double membrane bound organelle
What is DNA composed of?
Sugar, phosphate, nitrogenous base
46 Double-stranded DNA molecules are?
Chromosomes
Start codon (DNA) is
AUG
Genes code for what?
Proteins
First protein for amino acid is what?
MET
What happens during mitosis?
Cell division in somatic cells
What is somatic cell division?
One cell divides to produce two cells
What happens during meiosis?
Cell division in sex cells
What is centrosome?
What moves chromosomes
What are daughter cells?
Dividing into two identical cells
What is G2 phase?
Getting ready for cell division
4 Phases in the mitotic phase
Prophase, metaphase, anaphase, and telophase
What happens during prophase?
Forming of chromosomes
What is interphase?
Majority of cells life
What is the G1 phase?
Preparing for reproduction
What is S phase?
DNA replication
1st step of DNA replication
Unwinding of DNA molecule
2nd step of DNA replication
Breaking parent strands apart
3rd step of DNA replication
Assembly of new DNA strands
4th step of DNA replication
Restoration of DNA double helix
What happens during metaphase?
Chromosomes attach to each other aligning in the middle of the cell
What happens during anaphase?
Spindle fibers move separating chromosomes
What happens during telophase?
Nuclear division ends and begin to return to chromatin
What is cytokinesis?
Division of cytoplasm between two newly formed cells
What are the results of cleavage furrow?
Two new daughter cells
Cell division is complete after what?
Cytokinesis
What is apoptosis?
Programmed cell death