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 C
Explanation
A. Right common iliac artery:
Arises from the abdominal aorta; bifurcates into internal and external iliac arteries.
B. Right internal iliac artery:
Supplies pelvic organs; branches off the common iliac artery.
C. Left common iliac artery:
The left-side counterpart of the right common iliac.
D. Abdominal aorta:
Major artery running down the midline; bifurcates into the common iliac arteries around L4.
E. Right external iliac artery:
Continues into the femoral artery; runs along the pelvic brim.
F. Right femoral artery:
Located in the thigh, distal to the inguinal ligament; often seen in lower limb images.
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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