MCAT- Chemical and Physical Foundations of Biological Systems Questions with correct answers
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Module
MCAT
Institution
MCAT
An object is placed at the center of curvature of a concave mirror. Which of the following is true about the image?
A. It is real and inverted
B. It is virtual and inverted
C. It is real and upright
D. It is virtual and upright Correct Answer-A
One could solve this question with a ray diagram,...
MCAT- Chemical and Physical Foundations of
Biological Systems Questions with correct answers
An object is placed at the center of curvature of a concave mirror. Which
of the following is true about the image?
A. It is real and inverted
B. It is virtual and inverted
C. It is real and upright
D. It is virtual and upright Correct Answer-A
One could solve this question with a ray diagram, but be wary about
using these on Test Day. it is easy to make small mistakes. So solve the
question using the sign convention. If the object is at the center of
curvature, its distance is 2f. We can plug into the optics equation:
1/f=1/o+1/i --> 1/i=1/f-1/o=1/f=1/2f=1/2f
i=2f=r
because i is positive, the image is real. For single mirrors or lenses, all
real images are inverted.
When monochromatic light is refracted as it passes from air to glass,
which of the following does NOT remain the same? (Note: Assume that
the wave is fully transmitted)
A. Wavelength
B. Frequency
C. Amplitude
D. Period Correct Answer-
,3-hydroxybutanol can be formed by the reaction of
A. methanol in diethyl ether
B. ethanal in base, then in acid
C. butanal in strong acid
D. methanol and ethanal in catalytic base Correct Answer-
In Michaelis-Menten enzyme kinetics, what is the velocity of the
reaction when the substrate concentration is equal to Km?
A. 1/4 Vmax
B. 1/2 Vmax
C. Vmax
D. 2Vmax Correct Answer-B
The radius of the aorta is about 1 cm and blood passes through it at a
velocity of 30 cm/s. A typical capillary has a radius of about 4 x 10^-
4cm with blood passing through at a velocity of 5 x 10^-2 cm/s. Using
this data, what is the approximate number of capillaries in a human
body?
A. 1 x 10^4
B. 2 x 10^7
C. 4 x 10^9
D. 7 x 10^12 Correct Answer-C
,A test for proteins in urine involves precipitation but is often
complicated by precipitation of calcium phosphate. Which procedure
prevents precipitation of the salt?
A. Addition of buffer to maintain high pH
B. Addition of buffer to maintain a neutral pH
C. Addition of calcium hydroxide
D. Addition of sodium phosphate Correct Answer-B
Which solution contains an amino acid that would be most likely to
stabilize an anionic substrate in an enzyme pocket at physiological pH?
A. Solution 1
B. Solution 2
C. Solution 3
D. Solution 4 Correct Answer-D
Protons are found where? The have what charge? What is their mass?
Correct Answer-in the nucleus of an atom. +1. 1 atomic mass unit
, The atomic number (Z) of an element is equal to the number of
______________ in one of its atoms. Correct Answer-protons
Neutrons have what charge? Where are they located? What is their mass
in relation to a proton? Correct Answer-neutral. in the nucleus. Mass is
slightly larger than a proton
What makes up the mass number (A) of an atom Correct Answer-the
total number of protons and neutrons in a nucleus.
what are isotopes? Correct Answer-atoms that share an atomic number
but have different mass numbers. they differ in their number of neutrons
Where are electrons found? What is an electrons charge? What is their
mass in relation to a proton? Correct Answer-In the space surrounding
the nucleus (orbitals). -1. Mass is approx 1/2000 of a proton
Electrons move around the nucleus at varying ______, which correspond
to varying what? Correct Answer-varying distances which correspond to
varying levels of electrical potential energy.
Electrons closer to the nucleus are at ______ energy levels, while those
further out (in ________ _______ _______) have _____ energy. Correct
Answer-closer are at lower energy levels. those further out (in higher
electron shells) have higher energy
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