رد: مهم أحيـآآآء ..!
11) Oxygen crosses a plasma membrane by
A) osmosis.
B) phagocytosis.
C) active transport.
D) pinocytosis.
E) passive transport
23) Facilitated diffusion across a biological membrane requires ________ and moves a substance ________ its concentration gradient.
A) energy and transport proteins . . . down
B) energy . . . down
C) transport proteins . . . down
D) energy and transport proteins . . . against
E) transport proteins . . . against
63) A kilocalorie is defined as
A) the quantity of glucose needed to increase the body temperature by 1°C.
B) the quantity of water heat needed to solubilize 1 g of glucose.
كمية الحرارة اللازمة لرفع درجة حرارة 1 كجم من الماء عن 1 C°
C) the quantity of heat needed to raise the temperature of 1 kg of water by 1°C.
D) the quantity of food used to maintain normal bodily functions.
E) the quantity of food consumed during a given type of exercise.
84) In yeast cells, << السؤال دا جا مرتين
A) lactic acid is produced during anaerobic respiration.
B) lactic acid is produced during glycolysis.
C) alcohol is produced during the citric acid cycle.
D) alcohol is produced after glycolysis.
E) glucose is produced during photosynthesis.
87) When a cell uses fats for aerobic respiration, it first hydrolyzes fats to
A) glycerol and amino acids.
B) glycerol and fatty acids.
C) fatty acids and sugars.
D) sugars and amino acids.
E) sugars and glycerol
92) Autotrophs that utilize light as their energy source are
A) chemosynthetic autotrophs.
B) photoautotrophs.
C) consumers.
D) fungi.
E) heterotrophs
97) Chloroplasts contain disklike membranous sacs arranged in stacks called
A) cristae.
B) thylakoids.
C) grana.
D) vacuoles.
E) stroma.
Answer: C
115) The greenhouse effect is
A) reduced by photosynthesis, which removes carbon dioxide from the atmosphere.
B) made worse by photosynthesis, which adds carbon dioxide to the atmosphere.
C) reduced by the burning of fossil fuels, which removes oxygen from the atmosphere.
D) reduced by the addition of carbon dioxide to the atmosphere, since carbon dioxide removes excess heat from the Earth's surface and reflects it back into space.
E) of little concern, since it is part of the normal cycle for the planet
118) Ozone
A) formation is promoted by CFCs.
B) is broken down by carbon dioxide.
C) is a source of oxygen for cellular respiration.
D) levels in the atmosphere have been steadily increasing in the past century.
E) protects Earth from UV radiation
الحين الاسئله اللي من شابتر 16 لحالو الاسئله اللي جابوها من بره مافتكرتها << اساسا محدوفه
(16. What is one way that archaea differ from bacteria?
A absence of cell membrane
B type of cellular respiration
C presence of DNA
D cell wall composition
E presence of ribosomes
18. The sticky layers of protective slime produced by some bacteria enable them to:
A stick together and form biofilms.
B move from one location to another.
C sexually reproduce.
D survive extreme conditions for long periods of time.
E acquire resistance to antibiotics
21. Anaerobic bacteria can obtain energy by glycolysis and fermentation when ________ is not available.
A NADH
B light
C oxygen
D glucose
E nitrogen
الحين من شابتر (21 و 32 )
2) What is the physical barrier in the root that regulates the flow of water to xylem via cell walls?
A) phloem
B) epidermis
C) Casparian strip
D) cortex
E) plasmodesmata
21) Nitrogen fixation consists of
A) the conversion of ammonia to nitrate.
B) the conversion of nitrate to ammonia.
C) the production of ammonium from decomposing organic matter.
D) the conversion of N2 to ammonia.
E) the conversion of N2 to ammonia or nitrate
27) What happens to nutrient macromolecules in an animal's digestive tract?
A) They are absorbed whole and are broken down into monomers in cells that ultimately use them.
B) Proteins and nucleic acids are digested into monomers before absorption; energy-storage macromolecules (starch and fat) are absorbed whole.
C) The digestive breakdown of macromolecules is keyed to the body's need for monomers; only the monomers that are immediately needed are produced.
D) Nutrient macromolecules are digested into monomers before absorption.
E) Nucleic acids and triglycerides (which diffuse across the plasma membrane) are not digested into monomers, but other macromolecules are.
34) Smooth muscle propels food through the alimentary canal by a process called
A) circular contractions.
B) diffusion.
C) active transport.
D) peristalsis.
E) progurgitation
43) The stomach mixes food with secretions of the stomach wall to form
A) gastric juice.
B) a parietal bolus.
C) gastrin.
D) chyme.
E) acid gastrin.
46) Bile produced in the liver is stored in the ________ before entering the intestine.
A) pancreas
B) blood
C) gallbladder
D) intestinal wall
E) common bile duct
51) Nutrients absorbed by the intestines move directly to the liver, which
A) converts the nutrients into monomers.
B) converts excess glucose to glycogen.
C) produces platelets for blood clotting.
D) manages the amount of glucose that is converted to polysaccharides.
E) converts glucose to alcohol.
54) The rate of energy consumption by the body is called
A) bolism.
B) digestion.
C) bolic rate.
D) consumption.
E) glycolysis
1)
1)
Which figure depicts an animal cell placed in a solution hypotonic to the cell?
A)
cell A
B)
cell B
C)
cell C
D)
cell D
E)
cell E
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