Which of the following is a double-helix-shaped molecule that contains genetic information?
nucleus
genotype
DNA
Chromosome
The Correct Answer is C
A. nucleus: The nucleus is a cell structure that houses genetic material but is not itself a molecule; it contains chromosomes made of DNA.
B. genotype: Genotype refers to an individual’s genetic makeup (the set of genes), not a physical molecule.
C. DNA: DNA (deoxyribonucleic acid) is the double-helix molecule that carries genetic information.
D. chromosome: A chromosome is a packaged structure of DNA and proteins (histones); it contains DNA but is not the name of the double-helix molecule itself.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. fetal: Later period; more functional defects and growth issues than major structural ones.
B. implantation: Very early pre-embryonic stage; structural organ formation hasn’t begun.
C. embryonic: Weeks 3–8; organogenesis occurs, so risk of major structural defects is highest.
D. germinal: Conception to ~2 weeks; before organ formation, thus lower risk of structural anomalies.
Correct Answer is D
Explanation
A. formal operational: Formal operational stage spans approximately from ~11–12 years onward, not birth to 2 years.
B. preoperational: Preoperational covers roughly ages 2–7, so it does not start at birth.
C. concrete operational: Concrete operational typically covers about ages 7–11, later than birth to 2 years.
D. sensorimotor: Sensorimotor is Piaget’s stage from birth to about 2 years, making this the correct choice.
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