A. A-1,2-1
B. A-1,2+1
C. A,2-1
D. A+1,2-1
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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.
Therefore, the Correct Answer is A.
Which of the following is the term given to the sequence of nucleotides that contains the information to make a specific protein molecule?
A. Locus
B. Promoter
C. Operator
D. Gene
The Correct Answer is D.A gene is a segment of DNA that codes for a specific protein or polypeptide.
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.
Use the table below to answer the question
|
Object |
Mass |
Time of Fall |
|
A |
5.0g |
2.0 sec |
|
B |
5.0g |
1.0 sec |
|
C |
30.g |
0.5 sec |
|
D |
35.0g |
1.5 sec |
Which of the following conclusions is supported by the data?
A. Object A and B fall at the same rate
B. The time of fall is independent of the mass of the object
C. The greater the mass of an object, the faster it will fall
D. Air resistance is greater for A than for B
The Correct Answer is D.Objects A and B have the same and are subjected to the same gravitational pull. However, object B falls faster than A. This is due to a greater air resistance for A than B.
Which of the following structures drains oxygen-depleted blood from the kidneys?
A. Renal artery
B. Urethra
C. Ureter
D. Renal Vein
The Correct Answer is D.The renal vein drains deoxygenated blood from the kidneys to the inferior vena cava.
A slice of apple left on a table slowly goes brown due to an enzymatic reaction. Dipping the apple slice in lemon juice prevents it from browning Which of the following best explains this result?
A. Lemon juice has enzymes which reverse the browning reaction
B. Lemon juice has a pH which inactivates the enzymes
C. Lemon juice functions to bleach the brown material
D. Lemon juice functions to dilute the brown material
The Correct Answer is B.Browning of the apple surface is due to the action of the enzyme polyphenol oxidase. Lemon juice is acidic and lowers the pH of the apple's surface. This inactivates the enzyme polyphenol oxidase, which works best at a neutral pH. This in turn reduces the browning action on the apple.
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.
Which of the following pathways best represents the expected flow of blood from the human heart to an organ?
A. Blood pumped from the heart first enters arterioles that then merge to form arteries that deliver blood to the organ
B. Blood pumped from the heart first enters arteries that then narrow to form arterioles that deliver blood to capillaries of the organ
C. Blood pumped from the heart first enters versus that then narrow to form venules that deliver blood to arteries to the organ
D. Blood pumped from the heart first enters arteries that then narrow to form arterioles that deliver blood to capillaries
The Correct Answer is B.From the heart, blood flows through major arteries, which then branch to give rise to arterioles, which then divide into capillaries that deliver blood to the target organ.
Which of the following organelles is the site of intracellular digestion?
A. Mitochondria
B. Lysosomes
C. Centrosomes
D. Ribosomes
The Correct Answer is B.Lysosomes are membrane-bound organelles that contain lysozymes that are responsible for breaking down waste materials and cellular debris through intracellular digestion. This process helps maintain cellular health and homeostasis by recycling and degrading cellular components.
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 characteristics of water helps explain why coastal areas experience less dramatic temperature changes during the day?
A. Water has a high specific heat capacity
B. Water is a versatile solvent
C. Water forms covalent bonds with other water molecules
D. Water's adhesive properties prevent evaporation
The Correct Answer is A.Water has a high specific heat capacity, which means it can absorb and store a large amount of heat energy without significantly changing in temperature. This helps moderate the temperature fluctuations of the air near the coast, as water can store heat during the day and release it at night, or vice versa.