Sister chromatids are held together by a
centromere
centrosome
centriole
kinetichore
The Correct Answer is A
A. centromere: The centromere is the region of a chromosome where sister chromatids are tightly joined after DNA replication. It plays a critical role in ensuring proper alignment and separation of chromatids during cell division.
B. centrosome: The centrosome is an organelle that organizes microtubules and helps form the mitotic spindle during cell division. It is not responsible for holding sister chromatids together.
C. centriole: Centrioles are cylindrical structures within the centrosome that aid in spindle fiber formation. They assist in chromosome movement but do not act as the attachment site between sister chromatids.
D. kinetochore: The kinetochore is a protein complex assembled on the centromere that attaches to spindle fibers. It facilitates chromatid movement but is not the structure that holds sister chromatids together.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. synovial membrane:Synovial membranes line the cavities of freely movable joints and secrete synovial fluid for lubrication. They do not surround the heart or other internal organs.
B. serous membrane:The heart is surrounded by the pericardium, which is a serous membrane. This double-layered membrane produces serous fluid to reduce friction as the heart beats within the thoracic cavity.
C. cutaneous membrane:The cutaneous membrane refers to the skin, which covers the external surface of the body. It does not enclose internal organs like the heart.
D. mucus membrane:Mucus membranes line body cavities that open to the exterior, such as the respiratory and digestive tracts, and secrete mucus to protect and lubricate surfaces. They are not associated with the heart.
Correct Answer is D
Explanation
A. 2:Two ATP molecules are produced directly during glycolysis, but this represents only a small portion of the total ATP generated from one glucose molecule.
B. 6:Six ATP molecules are produced during the Krebs cycle per glucose molecule, but this does not account for the full yield from glycolysis, Krebs cycle, and oxidative phosphorylation combined.
C. 28:Approximately 28 ATP molecules are produced through oxidative phosphorylation and the electron transport chain, but when combined with the 2 ATP from glycolysis, the total ATP yield is higher.
D. 30:Complete cellular respiration of one glucose molecule, including glycolysis, the Krebs cycle, and oxidative phosphorylation, yields roughly 30 ATP in eukaryotic cells, representing the total energy harvested from one molecule of glucose.
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