Andrew & Kelley Will Get 35+ On MCAT
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Questions and Answers
- 1.
Has both wave & particle nature
- A.
Dispersion
- B.
Reflection
- C.
Diffraction
- D.
Refraction
Correct Answer(s)
B. Reflection
D. RefractionExplanation
Reflection and refraction are both phenomena that can be explained by the wave nature of light. When light waves encounter a boundary between two different mediums, such as air and water, they can be reflected or refracted. Reflection occurs when light waves bounce off the surface of the medium, while refraction happens when the light waves change direction as they pass through the boundary. Both of these behaviors demonstrate the wave nature of light, as they involve the interaction of light waves with the surrounding medium.Rate this question:
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- 2.
EMF of a galvanic vs electrolytic cell: Eº = E(cathode) - E(anode). Eº MUST be ____ for a galvanic (voltaic) cell and ____ for an electrolytic cell.
- A.
Positive, negative
- B.
Positive, positive
- C.
Negative, positive
- D.
Negative, negative
Correct Answer
A. Positive, negativeExplanation
In a galvanic (voltaic) cell, the EMF (Electromotive Force) is positive because the cathode has a higher potential than the anode. This positive EMF drives the spontaneous flow of electrons from the anode to the cathode, generating electrical energy. On the other hand, in an electrolytic cell, the EMF is negative because an external power source is used to force the non-spontaneous flow of electrons from the cathode to the anode. Therefore, the correct answer is "positive, negative".Rate this question:
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- 3.
What CHANGES as light goes from one medium to another?
- A.
Velocity
- B.
Frequency
- C.
Index of refraction
- D.
Wavelength
Correct Answer(s)
A. Velocity
C. Index of refraction
D. WavelengthExplanation
As light travels from one medium to another, several changes occur. Firstly, the velocity of light changes as it enters a different medium, since the speed of light is different in different materials. Secondly, the index of refraction changes, which is a measure of how much the speed of light is reduced in a particular medium compared to vacuum. Lastly, the wavelength of light also changes as it passes through different mediums, as it is inversely proportional to the index of refraction. Therefore, the correct answer is velocity, index of refraction, and wavelength.Rate this question:
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- 4.
Contraction of the atria is controlled by the
- A.
SA node
- B.
AV node
Correct Answer
A. SA nodeExplanation
The SA node, or sinoatrial node, is responsible for controlling the contraction of the atria. It is often referred to as the "natural pacemaker" of the heart. The SA node generates electrical impulses that initiate the contraction of the atria, causing them to pump blood into the ventricles. This electrical signal then travels to the AV node, which acts as a relay station to transmit the signal to the ventricles, causing them to contract and pump blood out of the heart.Rate this question:
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- 5.
How do you test for noncompetitive versus competitive inhibitors for enzymes? If you increase the substrate concentration, ______ inhibition can be overcome. This is because the enzyme will bind more often to the substrate than the enzyme will bind to the ____ inhibitor.
- A.
Noncompetitive
- B.
Competitive
Correct Answer
B. CompetitiveExplanation
Increasing the substrate concentration can overcome competitive inhibition. This is because in competitive inhibition, the inhibitor competes with the substrate for binding to the active site of the enzyme. By increasing the substrate concentration, there will be a higher chance for the substrate to successfully bind to the active site, outcompeting the inhibitor. Therefore, the inhibitory effect of the competitive inhibitor can be overcome.Rate this question:
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- 6.
Which is a better leaving group?
- A.
Fluorine (F)
- B.
Iodine (I)
Correct Answer
B. Iodine (I)Explanation
Iodine (I) is a better leaving group compared to Fluorine (F) because it is larger in size and has more electron density. This makes it easier for iodine to accept the negative charge when it leaves a molecule, resulting in a more stable leaving group. Fluorine, on the other hand, is smaller and has higher electron density, making it less likely to accept the negative charge and less stable as a leaving group.Rate this question:
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- 7.
An osmotiically active plasma protein which serves as the primary determinant of blood's osmotic pressure
Correct Answer
albumin
AlbuminExplanation
Albumin is an osmotically active plasma protein that plays a crucial role in maintaining the osmotic pressure of blood. It is the primary determinant of blood's osmotic pressure, meaning that it is responsible for regulating the movement of water between the blood vessels and tissues. Albumin helps to balance the fluid levels in the body and prevents excessive fluid loss from the blood vessels. It also transports various substances such as hormones, fatty acids, and drugs throughout the body. Overall, albumin is essential for maintaining the proper functioning of the circulatory system and ensuring the stability of blood pressure.Rate this question:
- 8.
Gives rise to the circulatory and digestive system
- A.
Ectoderm
- B.
Mesoderm
- C.
Endoderm
Correct Answer
B. MesodermExplanation
The mesoderm is one of the three primary germ layers that form during embryonic development. It gives rise to various structures and tissues in the body, including the circulatory and digestive systems. These systems are essential for the transportation of nutrients, oxygen, and waste products throughout the body, as well as the breakdown and absorption of food. Therefore, the mesoderm is responsible for the development of the circulatory and digestive systems.Rate this question:
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- 9.
In an electrolytic cell, the anode is
- A.
Positive
- B.
Negative
Correct Answer
A. PositiveExplanation
In an electrolytic cell, the anode is positive. This is because the anode is the electrode where oxidation occurs, meaning it loses electrons and becomes positively charged. The cathode, on the other hand, is the electrode where reduction occurs, meaning it gains electrons and becomes negatively charged. Therefore, the anode is always positive in an electrolytic cell.Rate this question:
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- 10.
Longitudinal waves move _____ to direction of propogation, like ___. Transverse waves move _____ to direction of propogation, like ___.
- A.
Perpendicular like light, parallel like sound
- B.
Parallel like sound, perpendicular like light
- C.
Perpendicular like sound, parallel like light
- D.
Parallel like light, perpendicular like sound
Correct Answer
B. Parallel like sound, perpendicular like lightExplanation
Longitudinal waves move parallel to the direction of propagation, similar to how sound waves move. Transverse waves, on the other hand, move perpendicular to the direction of propagation, similar to how light waves move.Rate this question:
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- 11.
LIGHT travels ____ in dense materials, whereas SOUND travels ____.
- A.
Faster, slower
- B.
Slower, faster
Correct Answer
B. Slower, fasterExplanation
Light travels slower in dense materials because the particles in the material obstruct and scatter the light waves, causing them to slow down. On the other hand, sound travels faster in dense materials because the particles are closer together, allowing the sound waves to propagate more quickly through the medium.Rate this question:
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Dec 08, 2023Quiz Edited by
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Mar 02, 2012Quiz Created by
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