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MCAT Natural Sciences
Biology & Genetics Topics
88
Science
Undergraduate 4
07/05/2013

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Cards

Term
Where does transcription take place?
Definition
In the nucleus
Term
Proteins being translated in the rough ER require recognition by this
Definition
SRP
Term
What is meant by the Golgi is a polar body?
Definition
Things enter through the cis face and leave out through the trans face
Term
This is done to release materials from inside a cell
Definition
Exocytosis
Term
True or false, DNA can leave the nucleus
Definition
False, DNA cannot leave the nucleus, this is why it is converted into RNA during protein synthesis
Term
This portion of the ER has ribosomes bound to it
Definition
Rough ER
Term
This form of endocytosis is done for the uptake of a ligand
Definition
Receptor Mediated Endocytosis
Term
Here is where RNA is transcribed and where ribosomes are assembled
Definition
The nucleolus
Term
Do prokaryotes have a nucleus?
Definition
No
Term
SRP recognizes what that tags it for the ER
Definition
A 20 amino acid sequence
Term
How does the RNA transcript leave the nucleus, what does it leave through?
Definition
Nuclear Pores
Term
This is the shipping and sorting center of the cell
Definition
The Golgi Complex
Term
If a protein is coded to have a mannose added to it and the golgi places a phosphate on the mannose, the product will go where?
Definition
The product will go to a lysosome
Term
This type of endocytosis is done to eat
Definition
Phagocytosis
Term
This type of endocytosis is done for the uptake of liquid
Definition
Pinocytosis
Term
In this lysosomal disease the phosphate is not placed on the mannose so the product does not go to the lysosome, instead it goes outside the cell (by default) and destroys the blood
Definition
I cell disease
Term
This is the end product of the Golgi Complex
Definition
A secretory vesicle filled with proteins
Term
Where is the nucleolus situated?
Definition
The nucleolus is situated inside the nucleus
Term
Where are the three places proteins can go after being exported from the Golgi complex?
Definition

1. To an endosome with the intent of reaching a lysosome

2. Out of the cell

3. To a mitochondrial body

Term
What is the general pH of a lysosome?
Definition
5
Term
What is the purpose of the cytoskeleton of the cell?
Definition
To give structure and mobility to the cell
Term
Proteins synthesized by the ER next move here via transport buds
Definition
The Golgi Complex
Term
Where does the main product packaged by the Golgi go?
Definition
It travels out of the cell
Term
These junctions allow electrolytes and and other molecules to pass between cells. They can be found in epithelial cells, cardiac and smooth muscle, in nervous and certain connective tissues
Definition
Gap Junctions
Term
This is the major feature of the Eukaryotic cell
Definition
The Nucleus
Term
What is the 9 + 2 arrangement in Eukaryotes
Definition
9 pairs of microtubules forming a circle around 2 lone microtubules
Term
This type of cellular junction is a watertight seal from cell to cell that blocks molecules from moving around and past the cell. It encircles cells like a belt
Definition
Tight Junctions
Term
How do secretory vesicles release their contents?
Definition
Via exocytosis
Term
Gap Junctions are formed through these channels which allow ions to travel through them
Definition
Connexon channels
Term
These cellular filaments are smaller than microtubules and use actin in muscle contraction
Definition
Microfilaments
Term
This organelle carries out steroid synthesis and detoxification via CYP450 enzymes
Definition
The smooth ER
Term
Microtubules are made from this protein
Definition
Tubulin
Term
This is the powerhouse of the cell
Definition
Mitochondria
Term
The outer (9) pairs are connected by these bridges, and allow for whip movement in cilia and wiggle movement in flagella
Definition
Dynein Cross Bridges
Term
Mitochondrial DNA is important for what?
Definition
It codes for unique ribosomes in mitochondria
Term
These cellular junctions are small tunnels that connect cells and allow small molecules and ions to move between cells
Definition
Gap Junctions
Term
This cellular junction joins two cells at a single point
Definition
A desmosome
Term
These are like spot welds which hold cells together and help prevent lateral tearing of tissues
Definition
Desmosomes
Term
What is the general pH or the blood?
Definition
7.3
Term
This is used in cellular communication, it travels short distances, is rapid, direct and specific
Definition
Neurotransmitter Communication
Term
This is responsible for resting membrane potential
Definition
The sodium potassium pump
Term
Where does the action potential start?
Definition
At the axon hillock
Term
During this period a super stimulus can start another action potential
Definition
The Relative Refractory Period
Term
This is used in cell communication and it travels long distances, is slower, has different effects in different cells, and travels via the blood stream
Definition
Hormones
Term
Which way does potassium move when potassium channels open up?
Definition
Potassium moves outside of the cell
Term
True or false, the sodium potassium pump is always open
Definition
True
Term
Lysosomes contain these enzymes that work best in an acidic environment (they can be used to break down large molecules)
Definition
Acid Hydrolases
Term
Mitochondrial DNA, which is DNA unique from the DNA of the cell, is passed on how?
Definition
Maternally
Term
When the sodium channel opens up where does sodium travel, in or out?
Definition
Sodium goes into the cell
Term
These junctions produce impermeable or semipermeable barriers between cells, especially in epethelial membranes
Definition
Tight Junctions
Term
Does the sodium potassium pump work with or against the concentration gradient?
Definition
It works against a concentration gradient this is why it requires ATP
Term
True or false, neurons divide
Definition
False, neurons never divide
Term
During hyperpolarization which channels are open
Definition
Both voltage gated sodium and potassium channels are closed, only the sodium potassium pump is working to pump 3 sodium ions out and 2 potassium ions in (the pump works against the gradient and requires ATP, it is always on)
Term
During depolarization which channels are open?
Definition
Sodium voltage gated channels are open
Term
As calcium travels into the axon terminal, what is triggered?
Definition
As calcium enters the axon terminal vesicles containing neurotransmitters are triggered and they bind to the terminal releasing the neurotransmitters into the synapse
Term
During repolarization, which channels are open?
Definition
Voltage gated potassium channels
Term
What is the general pH of the stomach?
Definition
2.5
Term
What occurs when the action potential reaches the axon terminal?
Definition
Calcium channels will open up and calcium will enter the terminal
Term
During this period, another stimulus will not cause the generation of another action potential
Definition
The Absolute Refractory Period
Term
What happens after the neurotransmitters are released into the synapse?
Definition
Neurotransmitters bind to G protein receptors or ligand gated receptors, and this opens up protein channels
Term
This is the stuff that surrounds the cell
Definition
Extracellular Matrix
Term
These neurons recieve signals from a receptor cell that interacts with its environment
Definition
Sensory neurons
Term
These neurons transfer signals from neuron to neuron
Definition
Interneurons
Term
These neurons are also called afferent neurons
Definition
Sensory Neurons
Term
These neurons carry signals to a muscle or gland called the effector
Definition
Motor Neurons
Term
These neurons are sometimes called efferent neurons
Definition
Motor Neurons
Term
Nerves are made up of these
Definition
Neuron axons and dendrites
Term
Bundles of neuron axons and dendrites in the PNS is called what?
Definition
Nerves
Term
Bundles of neuron axons and dendrites in the CNS is called what?
Definition
Tracts
Term
This nervous system (derived from the peripheral nervous system) was deisgned primarily to respond to the external environment
Definition
The somatic nervous system
Term
This portion of the autonomic nervous system deals with the fight or flight response
Definition
The Sympathetic ANS
Term
This portion of the autonomic nervous system deals with rest and digest processes
Definition
The Parasympathetic ANS
Term
A group of cell bodies located in the CNS is called what?
Definition
It is called a nucleus
Term
A group of cell bodies located outside the CNS is called what?
Definition
A ganglion
Term
What is the name given to receptors specifically made for acetylcholine
Definition
Cholinergic Receptors
Term
The receptors of epinephrine and nor epinephrine are called what?
Definition
Adrenergic
Term
The sympathetic nervous system releases these two neurotransmitters
Definition
Epinephrine and Norepinephrine
Term
I-cell disease is a lysosomal storage disease characterized by "inclusion bodies". Is it true that blood results will show high levels of lysosomal enzymes present in people with this disease
Definition
True
Term
Moving against a concentration gradient requires what?
Definition
ATP or another cellular energy source
Term
You culture bacteria in a petri dish and categorize it as pnemococcus. What is the shape of this bacterium?
Definition
Spherical
Term
What is the purpose of SRP
Definition
To target ribosomes to the ER
Term
Gram negative bacteria stain pinkish because they do not bind the purple crystal violet stain as well due to the fact that these bacteria have an outer membrane primarily composed of what?
Definition
LPS with bound polysaccharides
Term
Processing of proteins via glycosylation occurs where
Definition
In Golgi Bodies
Term
True or false, Yeast are multi cellular
Definition
False, yeast are unicellular organisms
Term
The difference between saturated and unsaturated fatty acids is the presence of what?
Definition
Double bond in unsaturated fatty acids
Term
The functional class of enzymes that add a phosphate group is called what?
Definition
Kinases
Term
Which molecules have a hard time passing through cell membranes
Definition
large molecules and polar molecules
Term
The group of enzymes that recognize and sever DNA palindromic sequences is
Definition
Restriction Enzymes
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