BIOL 2150 EXAM 3 QUESTIONS WITH VERIFIED ANSWERS
What are the main characteristics of animals? - Answers - multicellular eukaryotes,
chemoheterotrophs, no cell walls
Why don't animal cells have cell walls? - Answers - it allows for cell movement during
gastrolation
what type of animals have radial symmetry - Answers - cnidarians
what type of animals have bilateral symmetry - Answers - bilaterians
cephalization - Answers - concentration of nervous system components at one end of
the body
-usually the front
-adaptation that aids in forward locomotion
Gastrulation - Answers - the process in which a gastrula develops from a blastula
how can animals be separated by their embryonic organization? - Answers - during
gastrulation, some gastrula will form 2 layers, others will form 3 layers.
What is the embryonic organization of cnidaria - Answers - diploblastic (2 layers)
what are the two layers of diploblastic gastrula called? - Answers - ectoderm and
endoderm
What is the embryonic organization of bilateria - Answers - triploblastic (3 layers)
what are the three layers of triploblastic gastrula called? - Answers - ectoderm,
mesoderm, endoderm
what are deuterostomes - Answers - Animals that develop the anus before the mouth as
a blastopore
what are protostomes - Answers - Animals that develop the mouth before the anus as a
blastopore
what are the four main animal tissues? - Answers - epithelial, connective, muscle,
nervous
Epithelial tissue - Answers - lining of interior and exterior of animals and its organs.
these layer cells.
, connective tissue - Answers - ECM, connects tissues of different types. Dermis and
bone tissue.
muscle tissue - Answers - contracting tissues allowing for movement, usually connect to
bones
neuron tissue - Answers - electrical signals, send information from one to another.
what does neuron tissue specifically do? - Answers - -detect ion concentration changes
-accept (sense) info from the environment
-integrate (make sense) of information
Homeostasis - Answers - maintaining a constant set of internal conditions
explain the negative feedback loop for homeostasis - Answers - cold registers in the
hypothalamus, which causes muscles to shiver, creating heat. heat then registers in the
hypothalamus.
what is a neuron? - Answers - excitable cell with membrane potential changes. They are
basic units of a nervous system
what are the three types of neurons - Answers - sensory, motor, interneurons
what are the three main functions of the nervous system - Answers - 1. sense and
respond to environment
2. coordinate action of muscles
3. central to maintaining homeostasis
what do interneurons connect to - Answers - connect to other neurons
what do motor neurons connect to - Answers - connect to muscles
do sponges have a nervous system - Answers - no
describe cnidarian nervous system - Answers - very simple nervous systems
dendrites - Answers - inputs, receive signals, small and numerous processes
synapse - Answers - transfer electric signal to chemical
axon - Answers - output, single process
ganglion - Answers - clusters of neurons
nerve net - Answers - no brain
What are the main characteristics of animals? - Answers - multicellular eukaryotes,
chemoheterotrophs, no cell walls
Why don't animal cells have cell walls? - Answers - it allows for cell movement during
gastrolation
what type of animals have radial symmetry - Answers - cnidarians
what type of animals have bilateral symmetry - Answers - bilaterians
cephalization - Answers - concentration of nervous system components at one end of
the body
-usually the front
-adaptation that aids in forward locomotion
Gastrulation - Answers - the process in which a gastrula develops from a blastula
how can animals be separated by their embryonic organization? - Answers - during
gastrulation, some gastrula will form 2 layers, others will form 3 layers.
What is the embryonic organization of cnidaria - Answers - diploblastic (2 layers)
what are the two layers of diploblastic gastrula called? - Answers - ectoderm and
endoderm
What is the embryonic organization of bilateria - Answers - triploblastic (3 layers)
what are the three layers of triploblastic gastrula called? - Answers - ectoderm,
mesoderm, endoderm
what are deuterostomes - Answers - Animals that develop the anus before the mouth as
a blastopore
what are protostomes - Answers - Animals that develop the mouth before the anus as a
blastopore
what are the four main animal tissues? - Answers - epithelial, connective, muscle,
nervous
Epithelial tissue - Answers - lining of interior and exterior of animals and its organs.
these layer cells.
, connective tissue - Answers - ECM, connects tissues of different types. Dermis and
bone tissue.
muscle tissue - Answers - contracting tissues allowing for movement, usually connect to
bones
neuron tissue - Answers - electrical signals, send information from one to another.
what does neuron tissue specifically do? - Answers - -detect ion concentration changes
-accept (sense) info from the environment
-integrate (make sense) of information
Homeostasis - Answers - maintaining a constant set of internal conditions
explain the negative feedback loop for homeostasis - Answers - cold registers in the
hypothalamus, which causes muscles to shiver, creating heat. heat then registers in the
hypothalamus.
what is a neuron? - Answers - excitable cell with membrane potential changes. They are
basic units of a nervous system
what are the three types of neurons - Answers - sensory, motor, interneurons
what are the three main functions of the nervous system - Answers - 1. sense and
respond to environment
2. coordinate action of muscles
3. central to maintaining homeostasis
what do interneurons connect to - Answers - connect to other neurons
what do motor neurons connect to - Answers - connect to muscles
do sponges have a nervous system - Answers - no
describe cnidarian nervous system - Answers - very simple nervous systems
dendrites - Answers - inputs, receive signals, small and numerous processes
synapse - Answers - transfer electric signal to chemical
axon - Answers - output, single process
ganglion - Answers - clusters of neurons
nerve net - Answers - no brain
