Which of the following statements is true regarding telomeres?
Telomeres are cytoplasmic enzymes involved in senescence.
Telomeres are antioxidants that slow the progress of senescence.
Telomeres are DNA segments at each end of a chromosome.
Telomeres are proteins that cap the ends of the chromosomes.
Telomeres are motor molecules that guide embryonic cells to the right destinations.
The Correct Answer is C
A. Telomeres are cytoplasmic enzymes involved in senescence:
Telomeres are not enzymes and are not located in the cytoplasm. They are DNA structures found at the ends of chromosomes.
B. Telomeres are antioxidants that slow the progress of senescence:
Telomeres are not antioxidants; instead, they shorten with each cell division and are associated with the aging process.
C. Telomeres are DNA segments at each end of a chromosome:
Telomeres are repetitive nucleotide sequences (TTAGGG in humans) that protect chromosome ends from deterioration or fusion with neighboring chromosomes.
D. Telomeres are proteins that cap the ends of the chromosomes:
While telomere-associated proteins (like shelterin) exist, telomeres themselves are DNA sequences, not proteins.
E. Telomeres are motor molecules that guide embryonic cells to the right destinations:
Telomeres do not have a role in cell migration or embryonic development navigation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Metabolic acidosis: This occurs due to loss of bicarbonate (e.g., from diarrhea), not vomiting.
B. Metabolic alkalosis: Vomiting results in loss of hydrochloric acid from the stomach, leading to a relative increase in bicarbonate and metabolic alkalosis.
C. Respiratory alkalosis: Caused by hyperventilation, not vomiting.
D. Respiratory acidosis: Results from hypoventilation or lung disease, not gastrointestinal losses.
E. Lymphatic alkalosis: Not a recognized medical condition.
Correct Answer is D
Explanation
A. Renal hilum: The renal hilum is the medial opening of the kidney where vessels, nerves, and the ureter enter and exit.
B. Renal sinus: The renal sinus is the internal cavity of the kidney that contains the calyces, pelvis, vessels, and fat.
C. Major calyx: The major calyx is a large funnel-shaped structure that receives urine from multiple minor calyces.
D. Renal papilla: The renal papilla is the tip (apex) of a renal pyramid where urine is excreted into a minor calyx.
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