DAT Biology Actual Exam with Questions and 100% Correct Answers| Passed
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DAT Biology
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DAT Biology
Action potential - If threshold level of Na+ is reached/exceeded it will result in the opening of
the voltage gated Na+ channels down the entire length of the neuron. All or nothing event.
As stimulus intensity increases, the amplitude and speed of the action potential...? -
Remain constant
How...
DAT Biology Actual Exam with Questions
and 100% Correct Answers| Passed
Which organelle does protein/ribosome synthesis? - ✔✔Rough ER
All viruses are... - ✔✔Parasites
Viruses enter host cells by... - ✔✔Adsorption
Action potential - ✔✔If threshold level of Na+ is reached/exceeded it will result in the opening of
the voltage gated Na+ channels down the entire length of the neuron. All or nothing event.
As stimulus intensity increases, the amplitude and speed of the action potential...? -
✔✔Remain constant
How is amplitude of an action potential affected by frequency? - ✔✔It is not affected.
Action potentials increase as intensity of stimulus increases? - ✔✔TRUE. As stimulus
intensity increases, the # of action potentials (frequency) increase
Speed of an action potential - ✔✔Can be increased by myelination of an axon and also by
increasing the diameter of the axon
,Action potentials move faster along fibers that are... - ✔✔Thick
What controls the amplification of an action potential? - ✔✔Voltage gated Na+ channels
When a neuron is subjected to pressure, what occurs to the action potential? - ✔✔The
action potential remains constant
Where does action potential travel faster?
a. myelinated actin
b. myelinated myosin
c. unmyelinated actin
d. unmyelinated myosin - ✔✔b. Myleniated myosin
Myelinated because of saltatory conduction. Myosin is thicker than actin.
If you remove an animal from the water and it is segmented with multiple paired legs and a hard
exoskeleton, it belongs to? - ✔✔Arthropoda
Homeotic genes - ✔✔Regulate development of anatomical structures in various organisms. Control
of development by turning on and off other genes that code for substances that directly affect
development.
Mutation: wrong body parts in wrong places
Two sperm, one egg - ✔✔Triploid
Pacemaker of the heart - ✔✔Sinoatrial node (SA node)
If you cut the tip of a growing tree, the tree will... - ✔✔Grow bushier
,How many mature sperm during primary spermatocyte? - ✔✔0. The sperm are not mature until
the end
How many mature sperm are produced from one primary spermatocyte? - ✔✔4
What needs to happen for sperm to join egg? - ✔✔Sperm needs to reach oviduct
Dizygotic twin - ✔✔Two eggs, fertilized by two different sperm
Amnion and chorion comes from? - ✔✔Mesoderm (and trophoblast)
The chorion and amnion derived from _____ cells - ✔✔Embryonic
Epiblast - ✔✔Gives rise to endo/epi/mesoderm
What does the mesoderm make up? - ✔✔Muscles, heart, blood vessels
If Na+/K+ channels were inhibited, what would happen to the cell? - ✔✔There would be more Na+
in the cell
In a cross section of a nephron, where would you see the most mitochondria? - ✔✔In the
ascending loop of henle, which requires the most amount of atp for active transport
, Electron transport chain occurs where? - ✔✔Inner membrane
Maternal DNA comes from? - ✔✔Mitochondria
...and...come from older pre-existing cells. - ✔✔Mitochondria and chloroplasts
Which 2 organelles are thought to be derived from a prokaryote? - ✔✔Mitochondria and chloroplast
How is the mitochondria proof of the endosymbiotic theory? - ✔✔They have their own DNA
If genes are linked, they have less likelihood of...? - ✔✔Crossing over
Oxidative phosphorylation in the ETC occurs where? - ✔✔Inner mitochondrial membrane
Krebs cycle takes place where? - ✔✔Mitochondrial matrix
What kind of DNA is an exception to the universality of genetic code? - ✔✔Mitochondrial
Why is the mitochondria a free living organelle? - ✔✔It has its own DNA, has a double
membrane, reproduces by binary fission, is self-sufficient for energy
What protects the lungs from bacteria? - ✔✔Motile cilia in trachea
What protects the respiratory tract from bacteria? - ✔✔Motile cilia
Ependymal - ✔✔Glial cell that use cilia to circulate CSF
What is found in the trachea? - ✔✔Cilia
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