A. Electron
B. Quark
C. Neutron
D. Proton
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Rationale
Electrons are subatomic particles that have relatively little mass and are negligible when calculating atomic mass. The atomic number is usually the sum of protons and neutrons in the nucleus of the atom.
Therefore, the Correct Answer is A.
Which of the following would result in an increase in the chemical reaction?
A. Adding more of the product
B. Decreasing the concentration of the reactant
C. Sealing the reaction in an airtight container
D. Using a mortar and pestle to grind a solid reactant to a powder
The Correct Answer is D.Crushing a solid reactant into powder increases the surface area of the reactant, thereby increasing chemical reaction. This is because more of the reacting molecules or ions are exposed to the other reactant, which increases the chance of particles colliding and leads to more successful collisions per second.
The component of an atom that possesses relatively little mass, thus being negligible in calculating the atomic mass number, is the:
A. Electron
B. Quark
C. Neutron
D. Proton
The Correct Answer is A.Rationale
Electrons are subatomic particles that have relatively little mass and are negligible when calculating atomic mass. The atomic number is usually the sum of protons and neutrons in the nucleus of the atom.
The hip is an example of which of the following type of joints?
A. Ball-and-socket
B. Pivot
C. Gliding
D. Hinge
The Correct Answer is A.The hip joint is an example of a ball-and-socket joint. The hip joint is formed by the articulation of the head of the femur with the acetabulum of the pelvis. The rounded head of the femur (ball) fits into the cup-shaped acetabulum (socket), allowing for a wide range of motion in multiple planes.
Which of the following organs removes nitrogenous waste from the body?
A. Large Intestines
B. Liver
C. Kidneys
D. Gall Bladder
The Correct Answer is C.The kidneys are the primary organs involved in the excretion of nitrogenous wastes. Nitrogenous wastes are mostly products of protein metabolism in the liver. One of the common nitrogenous waste products is urea, which is excreted through the kidneys.
Which of the following distinguishes endocrine and exocrine glands from another?
A. The presence or absence of ducts
B. The effect their secretions have on the target cells
C. The biochemistry of their secretions
D. The presence or absence of nerve innervation
The Correct Answer is A.Exocrine glands secrete their products into ducts that carry them to the target organs. In contrast, endocrine glands secrete their products directly into the bloodstream, which carries them to target cells throughout the body.
Which of the following structures is present in both prokaryotic and eukaryotic cells
A. Chloroplast
B. Cell membrane
C. Golgi apparatus
D. Endoplasmic reticulum
The Correct Answer is B.Both prokaryotic and eukaryotic cells have a cell membrane. The cell membrane is a barrier that surrounds the cell and separates its internal environment from the external environment.
Using the equation PH = -log (H+), a solution with a (H+)= 10+ M has a PH of which of the following?
A. 9
B. 5
C. 1
D. 10
The Correct Answer is C.Concentration of H+ in the solution = 10 −1 M
pH= -log(10 −1)
pH= -(-1)
=1
Which of the following demonstrates a chemical reaction of water?
A. Water boils to produce steam at 100° C (252)
B. Water Dissolves sugar
C. Water produces gas with sodium metal
D. Water and all separate when combined
The Correct Answer is C.a. Water boils to produce steam at 100°C - This is a phase change (from liquid to gas) and not a chemical reaction of water.
b. Water dissolves sugar - This is a physical change, not a chemical reaction of water.
c. Water produces gas with sodium metal - This reaction involves the chemical reaction of water with sodium metal to produce hydrogen gas.
d. Water and oil separate when combined - This is a physical separation, not a chemical reaction of water.
A represents atomic mass and 2 represents an atomic number, which of the following describes an atom after a proton is emitted?
A. A-1,2-1
B. A-1,2+1
C. A,2-1
D. A+1,2-1
The Correct Answer is A.This is because when a proton is emitted from an atom, the atomic mass decreases by one unit, and the atomic number decreases by one unit. The atomic mass is the sum of protons and neutrons in the nucleus, and the atomic number is the number of protons in the nucleus. Therefore, if a proton is lost, both numbers decrease by one.
Which of the following respiratory structures is affected by a disease that disrupts gas exchange, such as emphysema?
A. Trachea
B. Secondary branch
C. Primary bronchi
D. Alveoli
The Correct Answer is D.