Which of the following organelles contains the DNA of the cell?
Ribosome
Nucleus
Mitochondria
Endoplasmic reticulum
The Correct Answer is B
A. Ribosome: Site of protein synthesis (translate mRNA to polypeptide); ribosomes themselves do not contain the cell’s genomic DNA.
B. Nucleus: The organelle that houses the cell’s chromosomal DNA in eukaryotic cells and organizes replication/transcription.
C. Mitochondria: Contain a small circular mitochondrial DNA (mtDNA) in addition to their metabolic role, but the nucleus contains the vast majority of the cell’s DNA.
D. Endoplasmic reticulum: Involved in protein and lipid synthesis (rough and smooth ER) and intracellular transport, not a storage site for genomic DNA.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Luteinizing Hormone (LH): LH triggers ovulation and supports the corpus luteum, but it is not the primary hormone that stimulates uterine contractions during labor.
B. Follicle Stimulating Hormone (FSH): FSH promotes follicle development in the ovary during the menstrual cycle, not uterine contractions.
C. Aldosterone: A mineralocorticoid that regulates sodium and potassium balance in the kidneys; it does not induce uterine contractions.
D. Oxytocin: Released from the posterior pituitary and from the uterus, oxytocin stimulates rhythmic uterine smooth muscle contractions during labor.
Correct Answer is A
Explanation
A. Lipase: Pancreatic and gastric lipases hydrolyze triglycerides into fatty acids and monoglycerides, enabling fat digestion.
B. Trypsin: A pancreatic protease that breaks peptide bonds in proteins, not fats.
C. Pepsin: A stomach enzyme that begins protein digestion by cleaving peptide bonds, not responsible for fat breakdown.
D. Amylase: An enzyme (salivary and pancreatic) that digests starches (carbohydrates), not lipids.
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