The photograph shows a sample of stained frog blood cells as viewed with the high-power objective of a compound light microscope, with a specific structure labeled "A".
Which of the following is the BEST description for the structure labeled "A?"
A Chloroplast that carries out photosynthesis
B Lysosome that stores hydrolytic enzymes
DC Mitochondrion that produces ATP
OD Nucleus that regulates cell activity

Frog´s erythrocytes might be about 50μm, are ovoid and biconvex, and present a nucleus with condensed chromatin. They are stained red by eosin and the nucleus by hematoxylin. DNI is the stained material in the cell.

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throwdolbeau throwdolbeau · Answer 2 · 2022-01-18T13:04:45+01:00

D. Nucleus that regulates cell activity

The structures labeled with the "A" are the nucleus of erythrocytes.

Frog erythrocytes form a more elliptical shape.

In addition, human erythrocytes lack a nucleus, but frog erythrocytes have nuclei and are capable of dividing.
They are also often larger than erythrocytes and have a nucleus, which can be seen as a dark region or regions within the cell.
Frog´s erythrocytes might be about 50μm, are ovoid and biconvex, and present a nucleus with condensed chromatin. They are stained red by eosin and the nucleus by hematoxylin. DNI is the stained material in the cell.

Thus, correct option is D.

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