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SCB 203 MIDTERM EXAM WITH QUESTIONS AND CORRECT ANSWERS/RATED A+
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SCB 203 MIDTERM EXAM WITH QUESTIONS AND CORRECT ANSWERS/RATED A+
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SCB 203 MIDTERM EXAM WITHQUESTIONS AND CORRECT
ANSWERS/RATED A+
cell - ANSWER>>>>>basic unit of life
tissue - ANSWER>>>>>2 or more cell types that combine to form a
tissue that has a specialized function
organ - ANSWER>>>>>2 or more tissue types that combine to form
an organ that has a specialized function
1. Respond to stimulus.
2. Eat food.
3. Growth.
4. Reproduction - ANSWER>>>>>4 Characteristics of Living Things
protection, water retention, secretion, excretion, regulates body
temp, vitamin D production - ANSWER>>>>>fxs of integumentary
system
yes - ANSWER>>>>>does cardiovascular system remove wastes?
negative feedback example 1 - ANSWER>>>>>activity of the
effector shuts off in response to the stimulus i.e high circulating
glucose levels (STIMULUS) prompt release of insulin (EFFECTOR).
once glucose is stored as glycogen, blood sugar levels drop and
resulting in inhibition of insulin release from pancreas occurs
matter - ANSWER>>>>>1. occupies space 2. has mass
energy - ANSWER>>>>>potential to do work
,electron - ANSWER>>>>>smallest mass-electron or proton?
atom - ANSWER>>>>>smallest unit of matter
element - ANSWER>>>>>asubstance where all atoms contain the
same number of protons in the nucleus.
unequal sharing of electrons - ANSWER>>>>>what is a
characteristic of a polar covalent bond
ionic bonds - ANSWER>>>>>ions are joined by electrostatic (non-
covalent!!!) forces--no physical bondage--only attraction-transfer of
electrons
disassociation - ANSWER>>>>>molecules split into smaller particles;
usually reversible
H20 i.e agua. i.e water - ANSWER>>>>>universal solvent
buffer - ANSWER>>>>>resists abrupt changes to pH upon addition
of acid or base to a solution
exergonic - ANSWER>>>>>RELEASES energy
endergonic - ANSWER>>>>>ABSORBS energy
water - ANSWER>>>>>can dissolve ionic and polar compounds.
enzymes - ANSWER>>>>>catalysts that accelerate the rate of a
chemical reaction by lowering activation energy (energy required
for a reaction to proceed)
CLANS - ANSWER>>>>>building blocks of cells
, glycosidic ond - ANSWER>>>>>covalent bond that bonds sugars to
one another
total e's in outer 3 shells - ANSWER>>>>>2, 8, 18
breaking down glycogen to glucose involves -
ANSWER>>>>>hydrolysis
dehydration synthesis ("join to lose water") -
ANSWER>>>>>glucose and fructose, can be joined together (to
form sucrose) via this method
H20, HF - ANSWER>>>>>example of POLAR covalent bonds
C02, 02, H2, N2, Cl2 - ANSWER>>>>>example of NON POLAR
covalent bonds
negative feedback - ANSWER>>>>>almost all homeostatic
mechanisms operate via
negative feedback example 2 - ANSWER>>>>>STIMULUS: it is cold
outside
RECEPTOR: Sensory receptors in skin detect cold & send
temperature info. to brain.
CONTROL CENTER: Hypothalamus of brain sets body temperature
at 37 degrees C (like thermostat) & directs response to effectors.
EFFECTOR: blood vessels in skin constrict; sweat glands become
inactive; skeletal muscles shiver to generate heat.
Heat is conserved.
Body temperature is returned to normal & Homeostasis is restored.
free radical - ANSWER>>>>>contains one or more unpaired
electrons, unstable, reactive, chain rx, some harmful/beneficial
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