Biology Exam 2

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163 Terms

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Smallest
Bacteria are the \------- of all cells
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10x
Plant and animal cells are \---- Larger
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Transmission Electron Microscope (TEM)
A microscope that uses an electron beam to study the internal cell structure.
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Cells must be large enough to
House DNA, proteins, and structures needed to survive and reproduce
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Surface to volume ratio
As a cell grows, its volume increases much faster than its surface area does.
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Bacteria, Archea
Prokaryotic cells
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Protists, Plants, Fungi, Animals
Eukaryotic Cells
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Plasma membrane, Chromosomes (DNA), Ribosome (Make proteins)
Both types of cells have (), (), and ()
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Pili
Attachment structures on the surface of some prokaryotes.
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Nucleoid
A dense region of DNA in a prokaryotic cell.
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Ribosomes
Makes proteins
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Plasma Membrane
A selectively-permeable phospholipid bilayer forming the boundary of the cells.
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Cell Wall
A rigid layer of nonliving material that surrounds the cells of plants and some other organisms.
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Capsule
A sticky layer that surrounds the cell walls of some bacteria, protecting the cell surface and sometimes helping to glue the cell to surfaces.
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Flagella
Whiplike tails found in one-celled organisms to aid in movement.
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Organelles
A tiny cell structure that carries out a specific function within the cell.
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Genetic Control
Nucleus and ribosomes
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Manufacturing, Distribution, Breakdown
endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles, and peroxisomes.
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Chloroplast
An organelle found in plant and algae cells where photosynthesis occurs
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Compartments
Eukyaroytic cells have ().
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Lysosome
Most plant cells don't have a ().
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Central Vacuole
Most animal cells don't have a ().
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Central Vacoule
large, fluid-filled organelle; store water, enzymes, metabolic, wastes, and other materials in plants.
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Plant
Cell walls are only in () cells.
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Phosopholipid bilayer
composition of plasma membrane, two layers of phosopholipids arranged tail-to-tail.
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Hydrophilic head, Hydrophobic tail
Phosopholipid Bilayers have a (), and ()
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Selectively Permeable
A membrane that allows some substances to pass through while excluding others.
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Chromatin
Substance found in eukaryotic chromosomes that consists of DNA tightly coiled.
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Nuclear Envelope
layer of two membranes that surrounds the nucleus of a cell.
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Endoplasmic Reticulum
A cell structure that forms a maze of passageways in which proteins and other materials are carried from one part of the cell to another.
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Nucleolus
Found inside the nucleus and produces ribosomes.
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rRNA
ribosomal RNA; type of RNA that makes up part of the ribosome.
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DNA Transcription
Copies a DNA strand to mRNA to fit through a pore into the cytoplasm.
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Translation
Process by which mRNA is decoded and a protein is produced.
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Free Ribosomes
Ribosomes suspended in the cytoplasm.
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Bound Ribosomes
Attached to the outside of the endoplasmic reticulum or nuclear envelope.
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Rough Endoplastic Reticulum (RER)
Surface for chemical reactions. Intracellular transport system. Has ribosomes attached to it.
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Smooth Endoplasmic Reticulum (SER)
the region of the endoplasmic reticulum that has few or no ribosomes on its cytoplasmic surface and synthesizes carbohydrates, lipids, and steroid hormones; detoxifies chemicals like pesticides, preservatives, medications, and environmental pollutants. Stores and releases lipids, oils, phospholipids, steroids.
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Golgi Apparatus, Endoplasmic Reticulum
The \_______ \_______ Receives, sorts and modifies substances manufactured by the \_______ \_______
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Golgi Apparatus
A system of membranes that modifies and packages proteins for export by the cell. Sorts them.
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Lysosomes
An organelle containing digestive enzymes, compartmentalization (highly organized and efficient/effective).
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Food
Lysosomes help \_____ particles engulfed by a cell
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remove, recycle
Lysosomes also help \_____ or \____ damaged parts of the cell.
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Abnormal
\_______ Lysosomes can cause fatal diseases
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Lysosomal Storage Diseases
A hereditary disorder associated with abnormal lysosomes, where the sufferer is missing one of the lysosomal digestive enzymes.
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Contractile Vacuole
The cell structure that collects extra water from the cytoplasm and then expels it from the cell.
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Peroxisomes
Contain oxidase enzymes that detoxify alcohol, hydrogen peroxide, and other harmful chemicals.
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Mitochondria
Powerhouse of the cell, carry out cellular respiration.
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ATP
(Adenosine triphosphate) main energy source that cells use for most of their work.
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Intermembrane Space
The fluid filled space between the inner and outer mitochondrial membranes.
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Mitochondrial Matrix
The compartment of the mitochondrion enclosed by the inner membrane and containing DNA and ribosomes, with enzymes.
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Cristae
infoldings in the inner membrane of a mitochondria. Increases the surface area to enhance ATP.
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Chloroplast
An organelle found in plant and algae cells where photosynthesis occurs.
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Intermembrane space
The fluid filled space between the inner and outer mitochondrial membranes.
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Stroma
fluid portion of the chloroplast that contain DNA, ribosomes, and enzymes.
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Thylakoids
A flattened membrane sac inside the chloroplast, used to convert light energy to chemical energy.
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Granum
A stack of thylakoids in a chloroplast that store solar energy.
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DNA and Ribosomes
Chloroplasts and Mitochondria have both \---- and \-----
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Endosymbiosis
A theorized process in which early eukaryotic cells were formed from simpler prokaryotes.
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Phagocytosis
Cell eating.
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Cilia
Hairlike projections (many and short) all over the outside of cells.
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Flagella
Few whiplike long tails found in one-celled organisms to aid in movement.
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Fluid, protect
Silia can also move \----- and \------ cells. (I.E. our lungs)
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Phthalates
found in cosmetics, deodorants, and many plastics used for food packaging, children's toys, and medical devices. Cause issues in sperm mobility.
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Cytoskeleton
A network of protein fibers that holds the cell together, helps the cell to keep its shape, and aids in movement and cell activity.
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The extracelluar matrix
is a collection of extracellular molecules secreted by cells that provides structural and biochemical support to the surrounding cells.
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Integrins
membrane proteins; they transmit signals between the ECM and cytoskeleton to regulate gene and cell activity.
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Plasma Membrane
A selectively-permeable phospholipid bilayer forming the boundary of the cells.
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Molecules
The Plasma Membrane controls traffic of \-------- in and out of cells
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Fluid mosaic
A description of membrane structure, depicting a cellular membrane as a mosaic of diverse protein molecules embedded in a fluid bilayer made of phospholipid molecules.
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Phosopholipids
Unsaturated fatty acids with kinks in their tails to keep the membrane in a liquid state.
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Fluid
Unsaturated fatty acid tails keep the membrane \-----.
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Framework (cytoskeleton & ECM), cell-to-cell recognition, Form junctions, metabolic pathways, Signal transduction
Functions of Proteins
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Glycoproteins
Membrane carbohydrates functioning as ID tags for cell to cell recognition.
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Signal transduction
A series of molecular changes that converts a signal on a target cell's surface to a specific response inside the cell.
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O2, CO2
\-- and \-- pass easily through the selectively permeable membrane.
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Passive Transport
The movement of substances across a cell membrane without the use of energy by the cell.
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Diffusion
Movement of molecules from an area of higher concentration to an area of lower concentration. Spread out evenly in an available space.
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Osmosis
Diffusion of water molecules across a selectively permeable membrane.
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Down
Water moves \____ its concentration gradient.
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Left to right
Water diffuses from \____ to \_____.
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Tonicity
The ability of a surrounding solution to cause a cell to gain or lose water (based on a dissolved solute)
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Isotonic
Same concentrations of solutes in and outside the cell. Water moves in and out at the same rate.
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Hypotonic
Solute concentration lower than that inside the cell; water moves into the cell, can cause it to burst.
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Lysed
Hypotonic animal cell that bursts
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Turgid
Hypotonic plant cell; cell wall prevents it from bursting
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Hypertonic
A solution with a solute concentration higher outside than inside the cell.
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Osmoregulation
Method by which organisms regulate solute concentrations to balance the gain and loss of water.
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Plasmolyzed
Plant cell in a hypertonic solution.
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Facilitated Diffusion
Doesn't require energy; Transport proteins span in membrane bilayer to help substances diffuse.
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Transport Protein
Proteins that bind, shape, and move substances like sugar, amino acids, and provide a pore for passage.
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Aquaporin
Water channel protein in a cell.
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Active Transport
Energy-requiring process that moves material across a cell membrane against a concentration difference.
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Small
Active transport moves \_____ molecules only.
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ATP (adenosine triphosphate)
Main energy source that cells use for most of their work
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Exocytosis
Process by which a cell releases large amounts of material outside.
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Endocytosis
Process by which a cell folds inward, enclosing material from the outside.
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Pinocytosis
Cell drinking, engulf fluids into small vesicles.
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Receptor-mediated endocytosis
Receptors interact with a certain protein, which attract and bind molecules. Cell folds membrane in and makes a vesicle.
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Exergonic
A chemical reaction that releases energy