Cell the unit of life part - 3

An elaborate network of filamentous proteinaceous structures present in the cytoplasm, which helps in the maintenance of cell shape, is called:

• Endoplasmic reticulum

• Plasmalemma

• Thylakoid

• Cytoskeleton

A single human cell has approximately ______ long thread of DNA distributed among its ______ chromosomes:

• 2 cm, 46

• 2 metre, 46

• 2 cm, 23

• 2 metre, 23

Who proposed the “cell lineage theory” by stating "Omnis cellula e cellula"?

• Karl Nageli

• Rudolf Virchow

• Schwann

• Anton Von Leeuwenhoek

Depending upon the ______, membrane proteins can be classified as integral or peripheral:

• Size

• Sedimentation rate

• Ease of extraction

• Molecular weight

In r-RNA, "r" stands for:

• Ribophorins

• Ribozyme

• Ribosomal

• SRP

Which element mainly occurs in the middle lamella?

• Ca

• Mg

• Na

• K

Carbohydrates are present in the plasmalemma in the form of:

• Hemicellulose

• Cellulose

• Starch

• Glycoprotein

The fluid nature of the membrane indicates its function of:

• Cell growth

• Cell division

• Endocytosis

• All of the above

Selective permeability occurs in:

• Cell wall

• Plasma membrane

• Cytoplasm

• None of these

In order to find out quickly whether the cells are living, one must observe:

• Cell sap

• Tonoplast

• Movement of cytoplasm

• Starch granules