1. The sacroplasmic reticulum. A. Shorten during muscle contraction (b) Transmit
ID: 181433 • Letter: 1
Question
1. The sacroplasmic reticulum. A. Shorten during muscle contraction (b) Transmits nerve impulses to the myofibrils (c) covers the muscle fiber (d) connects adjacent sacromeres (e) store calcium ions
2. Solution A contain 5 grams of sugar per liter while solution B contain 2 gram of sugar per liter. The solution are separated by a selectively permeable membrane. If the solvent in both solution is water, predict in which direction most of the water molecule will move.
A.) move by filtration from solution A to solution B
B) move by osmosis from solution b to solution A
c) move by active transport from solution B to solution A
d) there will be no movement of water
e) move by simple diffusion from solution A to solution B
3) which of the following is mismatched
a)aplastic anemia- bone marrow fails to produce erthyrocytes
b) hemolytic anemia- increased destruction of erythrocytes
C)iron deficiency-lack of iron absorption for erythropoiesis
D)pernicious anemia-loss of blood from the body
E) hemorrhagic anemia- loss of blood from the body
4. Which of the following pairs is mismatched?
A)hydrolysis- water is used in decomposition reaction
B) decomposition reaction - large reactant broken into smaller products
C)dehydration reaction - water is a product of the reaction
D) oxidation-gain of electrons
E) synthesis reaction- two reactant combine to form a larger product..
Explanation / Answer
1. e) store calcium ions
Cells in muscles are called muscle fibers and the cytoplasm in muscle cells are called sarcoplasm. Sarcoplasmic reticulum stores calcium ions, when it receives the signal it releases the calcium ion and initiates muscle contraction.
2. b) move by osmosis from solution B to solution A
Solute + Solvent = Solution. Sugar is the solute, Water is the solvent and the solution is the sugar dissolved in water.
Osmosis is the movement of solvent molecules through a semipermeable membrane from a low solute concentration to a more concentrated solution.
In this problem, solution B is the low conecntrated solution (2g in 1 litre)
solution A is the more concentrated solution (5g in 1 litre)
3. d) Perinicious anemia - loss of blood from the body
Red blood cells are also known as erythrocytes present in the blood. Erythrocytes contains the hemoglobin which transports oxygen and carbondioxide between lungs and tissues.
Perinicious anemia is the condition of having low RBC and is caused by the deficiency of vitamin B12 or cobalamin. Vitamin B12 is essential for the synthesis of RBC.
4. D) Oxidation - gain of electrons
Oxidation is loss of electron and reduction is gain of electron.
Dehydration is a condensation reaction with the loss of water molecule. Example: amino acids combine together to from peptide molecule with the loss of water.
Hydrolysis - water is used up in the reaction to form products. Decomposition is the splitting of single molecule into two or more simple molecule.
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