During which stage of mitosis do spindle fibers attach to the centromeres of chromosomes?
A. Anaphase
B. Metaphase
C. Prometaphase
D. Prophase
Answer: Option C
Solution (By JKSSB Mock Tests)
In prometaphase, the nuclear envelope breaks down, and spindle microtubules attach to kinetochores at the centromeres of chromosomes. This is a crucial step before alignment. In prophase, chromosomes condense; metaphase aligns them at the equator; anaphase separates chromatids. Prometaphase follows prophase in many descriptions.
Consider the following statements about proteins:
1. They are made of amino acids.
2. Peptide bonds link amino acids.
3. Hemoglobin is a transport protein.
Which of the above is/are correct?
Explanation:
A sphygmomanometer, often used with a stethoscope, measures arterial blood pressure (systolic/diastolic) in mmHg. A stethoscope listens to heart/lung sounds, thermometer measures temperature, ECG records heart electrical activity. Normal blood pressure is about 120/80 mmHg.
Explanation:
Thyroid-stimulating hormone (TSH) from the anterior pituitary binds to receptors on thyroid follicular cells, stimulating synthesis and release of thyroid hormones (T₃ and T₄). ACTH targets adrenal cortex.
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