Nokea
What type of bond is formed when two atoms share electrons unequally?
- A. Hydrogen bond
- B. Ionic bond
- C. Non-polar covalent bond
- D. Polar covalent bond
Correct Answer: D
Rationale: Polar covalent bonds (e.g., H2O) have unequal electron sharing due to electronegativity differences.
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Which muscle tissue type is responsible for involuntary contractions of the digestive tract?
- A. Skeletal muscle
- B. Cardiac muscle
- C. Smooth muscle
- D. Striated muscle
Correct Answer: C
Rationale: Smooth muscle powers involuntary contractions in the digestive tract.
Adipose
- A. Simple Cuboidal
- B. Simple Columnar
- C. Pseudost r atified Ciliated Columnar
Correct Answer: D
Rationale: Identification based on visual characteristics.
An atom of carbon has 6 protons, 6 neutrons and 6 electrons. What is the mass number of this isotope of carbon?
- A. 6
- B. 9
- C. 12
- D. 18
Correct Answer: C
Rationale: Mass number = protons + neutrons = 6 + 6 = 12 (carbon-12 isotope).
Which one of the following statements best describes DNA?
- A. single stranded, deoxyribonucleic acid
- B. single stranded, ribonucleic acid
- C. double stranded, deoxyribonucleic acid
- D. double stranded, ribonucleic acid
Correct Answer: C
Rationale: DNA is double stranded, while the "D" refers to "deoxy-."
Intervertebral discs are composed of:
- A. elastic connective tissue
- B. elastic cartilage
- C. hyaline cartilage
- D. fibrocartilage
Correct Answer: D
Rationale: Intervertebral discs are fibrocartilage, providing strength and flexibility.