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Chapter 4

PBSC Cells BSC1005 259323 CONCEPTS IN BIOLOGY

QuestionAnswer
______ proteins are "self" markers that indicates the cell belongs to that organism. Recognition
Which region of the phospholipid molecule is hydrophyllic? The Glycerol Head
A cell with an internal salt concentration of 0.1% salt is placed in a solution of 2% salt solution. Which way will water move, into or out of the cell? Out of the cell.
The framework inside a cell which keeps it from collapsing in on itself. The Cytoskeleton
The heart has ______ proteins for adrenaline which increases the heart's rate of contraction when bound. Surface
The process a cell uses to bring particles into the cell by pinching off a small circle of membrane to form a vesicle enclosing the particles. Endocytosis
_____ proteins bind chemicals in the cell's outside environment and regulate processes within the cell. Receptor
Which region of the phospholipid molecule is hydrophobic? Fatty Acid Tails
Equal solute concentrations. isotonic
Does diffusion move molecules down or up the concentration gradient? Down
The organelle which functions to transport and package proteins after they are made. It is dotted with ribosomes. The Rough Endoplasmic Reticulum (RER)
The ______ _______ is a unifying theory in biology which states that all living things are composed of cells and all cells arise from pre-existing cells. Cell Theory
This is the title for the model which describes the fluid nature of the phospholipids of the plasma membrane and the proteins dotting the surface. Fluid-Mosaic Model
This is the diffusion of water. Osmosis
The simple cell type, which does not contain organelles. Prokaryotic
The double lipid bilayer which defines the nucleus. The Nuclear Membrane
______ proteins on the cell membrane may speed up reactions. Enzymatic
The complex cell type which contains organelles. Eukaryotic
The organelle which functions as the final site for processing of proteins. Golgi Complex
A specialized form of exocytosis whereby compounds made by the cell are released into the surrounding tissue. Secretion
Small sacs (circles) of membrane are called _______. vesicles
The organelle which is the site of protein synthesis. The Ribosome
The organelle which is the site of photosynthesis in plants. The Chloroplast
The term for membranes which allow some molecules to pass through while blocking passage of other molecules. Selective Permeability
A cell with an internal salt concentration of 0.1% salt is placed in a solution of 2% salt solution. Is the solution surrounding the cell considered hypotonic or hypertonic? The solution surrounding the cell is considered hypertonic .
This is a special type of exocytosis whereby compounds made by the cell are released into the surrounding tissues. Secretion
The dark mass inside the nucleus which is the site of ribosomal subunit assembly. The Nucleolus
This method of moving molecules across the membrane uses proteins embedded in the membrane, and uses ATP energy to move molecules against (up) the concentration gradient. Active Transport
When the solute concentration is greater. Hypertonic
The organelle which houses the DNA (chromosomes) . The Nucleus
In a solution consisting of salt dissolved in water, which is the solute? salt
The process whereby vesicles fuse with the plasma membrane and are able to "dump" the contents to the outside of the cell. Exocytosis
How many layers of phospholipids are in a typical plasma (cell) membrane? TWO (a bilayer)
The large space inside plant cells where water and glucose are stored. Central Vacuole
The oganelle which is the site of aerobic respiration - also known as the "powerhouse" of the cell. The Mitochondria
Is the glycerol head of a phospholipid molecule polar or non-polar? Polar
These plasma membrane proteins penetrate through the phospholipid bilayer from one side to the other. They can act as gates or channels. Transmembrane
Name 4 items that involve vesicles. Endocytosis, Exocytosis, Secretion, Lysosomes
The organelle which functions to transport and package lipids and other molecules after they are made. The Smooth Endoplasmic Reticulum
This method of moving molecules across the membrane uses proteins embedded in the membrane, but does not use ATP energy. It also moves molecules down the concentration gradient. Passive Transport
These plasma membrane proteins reside only on the inner or outer side of the membrane. Surface
When the solute concentration is less. Hypotonic
Organelles known as "digestive sacs". Lysosomes
Another name for passive transport. Facilitated Diffusion