Biology Exam 2 Part 2

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81 Terms

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Membrane transport
substances must travel through the plasma membrane
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Substances want
equilibrium
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Plasma Membrane
phospholipid bilayer is differentially permeable
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Passive Transport
movement of molecules without energy
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diffusion
passive transport from an area of high concentration to low concentration
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Facilitated Diffusion
transport proteins help move hydrophilic and charged particles across the membrane (High to Low)
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Osmosis
diffusion of water across a membrane from high to low concentration (of the water)
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How does water move if a cell is placed in saltwater (saltwater is saltier than the water in the cell)
Osmosis will cause water to move out of the cell
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Osmosis
diffusion of water across a membrane from high to low concentration
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Aquaphorins
special proteins that help water cross the membrane faster/easier
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Does water require aquaphorins to cross the membrane?
NO
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What describes the active transport of potassium?
K+ will move from low to high concentration, energy is used
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Active transport
uses energy to take things from low to high concentration
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Exocytosis
a membrane bound vesicle fuses with the membrane and expels the large molecule outside the cell
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Endocytosis
a vesicle pinches the plasma membrane inward, and brings a large molecule into the cell
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Nutrient
substance in food that provides structural materials or energy
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Macronutrients
nutrients required in large amounts
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Do humans get half our water from our food?
yes
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How much percent water are humans?
78-43% water (declines with age)
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Carbohydrates
main energy source, ex. bread, cereal, rice, pasta
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Digestion of Carbohydrates
simple sugars: digested easy
complex carbohydrates: digested slowly
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Healthy diet
carbs should mostly be complex carbohydrates
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Whole food
unprocessed food not stripped of nutrition
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Processed food
processing, refining, grinding
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Furver (roughage)
indigestible. complex carbohydrates, some digested by bacteria in large intesting
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Proteins
parts of cellular structures and processes, ex beef, eggs, gluten
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Protein structure
polymers of amino acids
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Essential Amino Acids
cannot be made in the body, must get from food
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Nonessential amino acids
made in body
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Complete protein
contains ALL of the essential amino acids
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A fatty acid tail contains carbon that is double bonded to another carbon, what fat has this structure?
Unsaturated fat
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Fats
source of stored energy, ex. milk, cheese, insulates body and organs
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Fat structural composition
3 carbon skeleton attacked to 3 fatty acid tails
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Essential Body Acids
cannot be made in the body, ex omega 3
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Saturated Fat
fatty acid carbon bond to as much hydrogen as possible, solid at room temp. ex. animal fats
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Saturated Fats
fewer hydrogens are bound to carbons, liquid at room temp, ex. plant fats
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Polyunsaturated fats
many double bonds
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Hydrogenation
process adds hydrogen atoms to solidify unsaturated fats(ex. oils), ex margarine,
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Trans Fat
produced by incomplete hydrogenation, double bonds are flat and not kinked, increased health risks
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What vitamin can be synthesized by the human body?
Vitamin D
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Micronutrients
required in small quantities, two types; vitamins and minerals, not broken down by the body
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Vitamins
organic substances that mostly cannot be synthesized by the body
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Fat Soluble
stored in fat, excess accumulation can be toxic
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Minerals
inorganic substances (no carbon)
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Minerals are:
water soluble, supplied through diet, essential, ex. calcium, magnesium
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Calcium
commonly supplemented mineral, needed for blood clotting
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Antioxidants
electron donor molecule, prevent cell damage
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Metabolism
all chemical reactions occurring in the body
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How do enzymes affect metabolic reaction?
Enzymes decrease the activation energy of a reaction
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Enzymes
proteins that catalyze(speed up) chemical reactions, end in suffix -ase
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Activation energy
energy required to start a metabolic reaction
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Substrate
chemical being metabolized
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Active site
enzyme region where substrate binds
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Enzyme Specificity
each enzyme catalyzes a particular reaction bases on enzyme shape and active site shape
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Metabolic Rate
measure of a person's energy use
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basal metabolic rate
the energy use of a resting, wakeful animal, human is 1680 calories a day
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What influences BMR?
exercise, bio sex, age, genetics
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What part of this structure will be removed to release energy?
to the last negatively charged phosphate
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Cellular Respiration
series of metabolic reactions converting food energy to a usable form and releasing waste products
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Adenosine Triphosphate (ATP)
provides energy to drive processes in living cells
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Phosphorylation
phosphate group transferred from ATP to ADP
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What is the ADP and ATP battery analogy?
ADP: low battery
ATP: full battery
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Whats is the equation for cellular respiration?
glucose + oxygen = carbon dioxide + water, C6H12O6+6O2=6H2O+6CO2
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Cellular respiration
requires oxygen from breathing; releases carbon dioxide for delivery to lungs for exhalation
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Aerobic Respiration
occurs mostly in the mitochondria, series of complex directions
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NAD+
taxicab for electrons
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NAD+ is
empty, no electrons or hydrogen
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NADH is
full of electrons and hydrogen
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What are the three stages of cellular respiration?
1. Glycolysis
2. Citric acid cycle
3. Electron transport chain and ATP synthesis
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What step of the cellular respiration does not require oxygen?
Glycolysis
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Glycolysis
6 carbon molecules broken down into two pyruvic acid molecules, occurs in cytosol, doesn't need oxygen
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After Glycolysis
pyruvic oxidation happens, 2 carbon fragment metabolized inside mitochondria
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Citric Acid Cycle
series of enzyme catalyzed reactions in the mitochondrial matrix
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What does the Citric Acid Cycle produce?
Produces 4ATP and 10 NADH
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H+ and ATP synthase
26 ATP molecules synthesized, each NADH yields ~2.5 ATP
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What is an inaccurate description of what happens in the electron transport chain and ATP synthesis?
Water molecules are dropped off by NADH and used by membrane proteins
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If carbohydrates are unavailable
fats will be uses
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If carbohydrates and fats are unavailable
protein will be uses
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Why does lactic acid build up in muscle cells during intense exercise?
Oxygen is less available as an electron acceptor
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Anerobic respiration
metabolic process to generate energy without oxygen
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Fermentation
one process cells use to produce energy without oxygen