Bio 253 exam 1 Prep
BIO 253 EXAM 1 PREP NEWEST 2026/2027 ACTUAL EXAM
COMPLETE 100 QUESTIONS AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND NEW
VERSION!!
1. Which level of organization is the most complex?
A. Cellular level
B. Organ level
C. Chemical level
D. Organismal level
Correct Answer: D
2. A horizontal plane that divides the body into superior and inferior
portions is called:
A. Sagittal plane
B. Frontal plane
C. Transverse plane
D. Coronal plane
Correct Answer: C
3. In a negative feedback loop, what is the role of the "effector"?
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, Bio 253 exam 1 Prep
A. To detect the initial change in the environment
B. To process information and determine the set point
C. To carry out the response that reverses the stimulus
D. To act as the stimulus itself
Correct Answer: C
4. The knee is _______ to the ankle.
A. Proximal
B. Distal
C. Medial
D. Lateral
Correct Answer: A
5. Which cavity contains the lungs?
A. Pericardial cavity
B. Pelvic cavity
C. Pleural cavity
D. Abdominal cavity
Correct Answer: C
6. The "standard" anatomical position involves the palms facing:
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, Bio 253 exam 1 Prep
A. Posteriorly
B. Medially
C. Anteriorly
D. Laterally
Correct Answer: C
7. Which of the following is an example of positive feedback?
A. Regulation of body temperature
B. Blood glucose regulation
C. Childbirth (labor contractions)
D. Blood pressure regulation
Correct Answer: C
8. An atom that has gained an electron and now carries a negative
charge is called a(n):
A. Cation
B. Anion
C. Isotope
D. Molecule
Correct Answer: B
3|Page
, Bio 253 exam 1 Prep
9. What type of bond is formed by the equal sharing of electrons?
A. Ionic bond
B. Polar covalent bond
C. Nonpolar covalent bond
D. Hydrogen bond
Correct Answer: C
10. Which organic molecule is the primary source of cellular energy
(ATP)?
A. Lipids
B. Proteins
C. Nucleic acids
D. Carbohydrates
Correct Answer: D
11. A substance with a pH of 3.0 is considered:
A. Weakly basic
B. Strongly acidic
C. Neutral
D. Strongly basic
Correct Answer: B
4|Page
BIO 253 EXAM 1 PREP NEWEST 2026/2027 ACTUAL EXAM
COMPLETE 100 QUESTIONS AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND NEW
VERSION!!
1. Which level of organization is the most complex?
A. Cellular level
B. Organ level
C. Chemical level
D. Organismal level
Correct Answer: D
2. A horizontal plane that divides the body into superior and inferior
portions is called:
A. Sagittal plane
B. Frontal plane
C. Transverse plane
D. Coronal plane
Correct Answer: C
3. In a negative feedback loop, what is the role of the "effector"?
1|Page
, Bio 253 exam 1 Prep
A. To detect the initial change in the environment
B. To process information and determine the set point
C. To carry out the response that reverses the stimulus
D. To act as the stimulus itself
Correct Answer: C
4. The knee is _______ to the ankle.
A. Proximal
B. Distal
C. Medial
D. Lateral
Correct Answer: A
5. Which cavity contains the lungs?
A. Pericardial cavity
B. Pelvic cavity
C. Pleural cavity
D. Abdominal cavity
Correct Answer: C
6. The "standard" anatomical position involves the palms facing:
2|Page
, Bio 253 exam 1 Prep
A. Posteriorly
B. Medially
C. Anteriorly
D. Laterally
Correct Answer: C
7. Which of the following is an example of positive feedback?
A. Regulation of body temperature
B. Blood glucose regulation
C. Childbirth (labor contractions)
D. Blood pressure regulation
Correct Answer: C
8. An atom that has gained an electron and now carries a negative
charge is called a(n):
A. Cation
B. Anion
C. Isotope
D. Molecule
Correct Answer: B
3|Page
, Bio 253 exam 1 Prep
9. What type of bond is formed by the equal sharing of electrons?
A. Ionic bond
B. Polar covalent bond
C. Nonpolar covalent bond
D. Hydrogen bond
Correct Answer: C
10. Which organic molecule is the primary source of cellular energy
(ATP)?
A. Lipids
B. Proteins
C. Nucleic acids
D. Carbohydrates
Correct Answer: D
11. A substance with a pH of 3.0 is considered:
A. Weakly basic
B. Strongly acidic
C. Neutral
D. Strongly basic
Correct Answer: B
4|Page
