i Which organelles possess DNA ii What is the function of WB

(i) Which organelles possess DNA? (ii) What is the function of WBC in the body? (iii) What is the function of the organelle that animal cells have but plant cells do not? (iv) Name the unit of muscle fibre.

Solution

(i) Which organelles possess DNA?

Eukaryotic cells are more complex than prokaryotic cell.

they show considerable number of various structures.

The nucleus contains the greater part of the hereditary material (DNA) of the cell.

Extra DNA is in the mitochondria and chloroplasts.

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(ii) What is the function of WBC in the body?

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(iii) What is the function of the organelle that animal cells have but plant cells do not?

centrioles

they play a significant role in cell division yet the plant cells can duplicate even without the centrioles.

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(iv) Name the unit of muscle fibre.

sarcomeres,

they basic functional units of the muscle fiber

It is the essential unit of striated muscle tissue.

Skeletal muscles are made out of myocytes called muscle filaments or myofibers.

Muscle filaments contain various tubular myofibrils.

Myofibrils are made out of repeated units of sarcomeres.