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 E
Explanation
A. Fluid sequestration in the upper limbs: Not typically a physiological response to cold.
B. Hypotonic hydration: Occurs when too much water dilutes body fluids, usually from overhydration, not cold exposure.
C. Hypervolemia: This is fluid overload, unlikely in cold exposure without excess intake.
D. Increased sensible water loss: Sensible water loss refers to loss via urine or sweat—sweating is reduced in cold environments.
E. Increased respiratory water loss: Cold, dry air increases insensible water loss via respiration due to humidification of inspired air.
Correct Answer is A
Explanation
A. Liver: The liver is a large, reddish-brown organ in the right upper quadrant of the abdomen, just beneath the diaphragm. If the diagram is pointing to this area, especially the largest solid organ on the right side, it matches the liver’s location and size.
B. Stomach: The stomach is located mainly in the left upper quadrant, inferior to the diaphragm and to the left of the liver. It is smaller and has a J-shaped structure, so it would not match if the pointer is on the large right-sided organ.
C. Spleen: The spleen is located in the left upper quadrant, lateral to the stomach and posterior to the rib cage. It is much smaller than the liver and not in the right-sided position indicated.
D. Diaphragm: The diaphragm is a dome-shaped muscle that separates the thoracic and abdominal cavities. If the pointer is on the muscle just beneath the lungs, it would be the diaphragm, but here it’s on a large organ, not a muscle.
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