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def: a tail of chain with no double bonds so it has a full compliment of hydrogen bonds.

saturated fats are solid at room temperature.

animals usually have more saturated fats

Sliding Clamp (chapter 6)

def: a replication protein that keeps the polymerase attached to the template while it is synthesizing new strands of DNA

Secretion (chapter 15)

def: Production and release of a substance from a cell.

Secretory Vesicle (chapter 15)

def: Membrane-enclosed organelle in which molecules destined for secretion are stored prior to release. Sometimes called the secretory granule because darkly staining contents make the organelle visible as a small, solid object.

Signal Sequence (chapter 15)

def: Amino acid sequence that directs a protein to a specific location in the cell, such as the nucleus or mitochondria.

SNARE (chapter 15)

def: One of a family of membrane proteins responsible for the selective fusion of vesicles with a target membrane inside the cell.

Second Messenger (chapter 15)

def: Small molecule formed in or released into the cytosol in response to an extracellular signal that helps to relay the signal to the interior of the cell. Examples include cAMP, IP3 , and Ca2+

Serine/Threonine Kinase (chapter 15)

def: Enzyme that phosphorylates specific proteins on serines or threonines.

Signal Transduction (chapter 15)

def: Conversion of an impulse or stimulus from on physical or chemical form to another. In cell biology, the process by which a cell responds to an extracellular signal.

Steroid Hormone (chapter 16)

def: Lipophilic molecule related to cholesterol that acts as a hormone. Examples include estrogen and testosterone.

Sacromere (chapter 16)


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