MI017MTTC Biology Practice Exam
**Question 1. Which of the following best defines a scientific hypothesis?**
A) A proven fact that cannot be changed
B) An educated guess that can be tested experimentally
C) A law that explains all observations in a field
D) A theory that has never been questioned
Answer: B
Explanation: A hypothesis is a tentative explanation that can be tested and
potentially falsified through experimentation.
**Question 2. In an experiment, the variable that is intentionally changed by the
researcher is the:**
A) Dependent variable
B) Independent variable
C) Controlled variable
D) Confounding variable
Answer: B
Explanation: The independent variable is manipulated to observe its effect on the
dependent variable.
, MI017MTTC Biology Practice Exam
**Question 3. Which statistical measure is most appropriate for describing the
central tendency of a highly skewed data set?**
A) Mean
B) Median
C) Mode
D) Range
Answer: B
Explanation: The median is less affected by extreme values and therefore better
represents the center of skewed data.
**Question 4. The SI unit for measuring the amount of substance is:**
A) Kilogram
B) Mole
C) Candela
D) Kelvin
Answer: B
Explanation: The mole (mol) quantifies the number of particles (atoms, molecules)
in a sample.
, MI017MTTC Biology Practice Exam
**Question 5. When using a compound microscope, which of the following
adjustments improves resolution?**
A) Increasing the aperture diaphragm size
B) Decreasing the numerical aperture of the objective lens
C) Using a shorter wavelength of light
D) Using a longer working distance
Answer: C
Explanation: Shorter wavelengths of light reduce diffraction, enhancing resolution.
**Question 6. Which safety equipment is essential when handling a volatile
organic solvent in the lab?**
A) Ear plugs
B) Fume hood
C) Petri dish
D) Centrifuge
Answer: B
Explanation: A fume hood removes hazardous vapors, protecting the user from
inhalation.
, MI017MTTC Biology Practice Exam
**Question 7. The primary type of chemical bond that holds the two strands of
DNA together is:**
A) Ionic bond
B) Covalent bond
C) Hydrogen bond
D) Metallic bond
Answer: C
Explanation: Hydrogen bonds form between complementary nitrogenous bases,
stabilizing the DNA double helix.
**Question 8. Which property of water allows plants to transport water from
roots to leaves against gravity?**
A) Low specific heat
B) Cohesion
C) High compressibility
D) Low polarity
Answer: B
Explanation: Cohesion (water molecules attracting each other) creates a
continuous column of water in xylem.
**Question 1. Which of the following best defines a scientific hypothesis?**
A) A proven fact that cannot be changed
B) An educated guess that can be tested experimentally
C) A law that explains all observations in a field
D) A theory that has never been questioned
Answer: B
Explanation: A hypothesis is a tentative explanation that can be tested and
potentially falsified through experimentation.
**Question 2. In an experiment, the variable that is intentionally changed by the
researcher is the:**
A) Dependent variable
B) Independent variable
C) Controlled variable
D) Confounding variable
Answer: B
Explanation: The independent variable is manipulated to observe its effect on the
dependent variable.
, MI017MTTC Biology Practice Exam
**Question 3. Which statistical measure is most appropriate for describing the
central tendency of a highly skewed data set?**
A) Mean
B) Median
C) Mode
D) Range
Answer: B
Explanation: The median is less affected by extreme values and therefore better
represents the center of skewed data.
**Question 4. The SI unit for measuring the amount of substance is:**
A) Kilogram
B) Mole
C) Candela
D) Kelvin
Answer: B
Explanation: The mole (mol) quantifies the number of particles (atoms, molecules)
in a sample.
, MI017MTTC Biology Practice Exam
**Question 5. When using a compound microscope, which of the following
adjustments improves resolution?**
A) Increasing the aperture diaphragm size
B) Decreasing the numerical aperture of the objective lens
C) Using a shorter wavelength of light
D) Using a longer working distance
Answer: C
Explanation: Shorter wavelengths of light reduce diffraction, enhancing resolution.
**Question 6. Which safety equipment is essential when handling a volatile
organic solvent in the lab?**
A) Ear plugs
B) Fume hood
C) Petri dish
D) Centrifuge
Answer: B
Explanation: A fume hood removes hazardous vapors, protecting the user from
inhalation.
, MI017MTTC Biology Practice Exam
**Question 7. The primary type of chemical bond that holds the two strands of
DNA together is:**
A) Ionic bond
B) Covalent bond
C) Hydrogen bond
D) Metallic bond
Answer: C
Explanation: Hydrogen bonds form between complementary nitrogenous bases,
stabilizing the DNA double helix.
**Question 8. Which property of water allows plants to transport water from
roots to leaves against gravity?**
A) Low specific heat
B) Cohesion
C) High compressibility
D) Low polarity
Answer: B
Explanation: Cohesion (water molecules attracting each other) creates a
continuous column of water in xylem.
