Cell Biology

Prophase is the first stage of mitosis where the chromatin condenses into visible chromosomes, the nuclear membrane begins to break down, and the spindle fibers start to form. In an animal cell, the centrioles move to opposite poles of the cell.

- Chromosomes are visible as two chromatids joined at the centromere.
- The nuclear membrane starts to disintegrate.
- The spindle fibers begin to form and extend from the centrioles.
In the diagram, four chromosomes should be clearly visible, and labels should indicate the centromere, chromatid, nuclear membrane, spindle fibers, and centrioles.

The diagram shows the structure of a kidney, and we need to match each structure with its corresponding function. Below is the matching of each structure to its respective function: • Renal Medulla - (d) Has Henle’s loops.
The renal medulla contains the renal pyramids, which have Henle’s loops that are essential for the reabsorption of water and salts from urine. •

Renal Cortex - (a) Has Malpighian capsules.
The renal cortex contains the Malpighian (or renal) capsules, which are involved in the filtration of blood to form urine.

• Renal Artery - (b) Carries oxygenated blood.
The renal artery supplies oxygenated blood to the kidneys, allowing them to filter blood and regulate the body's water and salt balance.

• Renal Vein - (e) Carries deoxygenated blood.
The renal vein drains deoxygenated blood from the kidneys back into the circulatory system after the kidneys have filtered it.

• Pelvis - (f) Receives urine which flows into the ureter.
The renal pelvis collects the urine produced by the kidneys and transports it to the ureter, which carries it to the urinary bladder.

• Ureter - (c) Transports urine to the urinary bladder.
The ureter is responsible for transporting urine from the renal pelvis to the urinary bladder for storage before excretion.