Cell Biology: Nucleus Introduction

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Which of the following structures is responsible for transporting biomolecules between the nucleoplasm and the cytoplasm?

Chromatin fibers

Nucleoplasmic matrix

Nuclear scaffold

Nuclear pores (correct)

What is the primary protein component of chromatin?

Transcription factors

Histones (correct)

Polymerase chain reaction

RNA polymerase

Which term refers to the condensed form of chromatin?

Chromatid

Nucleosome

Euchromatin

Heterochromatin (correct)

What is the site of formation of ribosomal constituents inside the nucleus?

Nucleolus Signup and view all the answers

What maintains the nucleus's shape and acts as a framework upon which chromatin is organized?

Nuclear matrix Signup and view all the answers

Which of the following classes of ribosomes contains a long 28 S rRNA chain with 4700 nucleotides?

Eukaryotic ribosomes Signup and view all the answers

What is the sedimentation constant of prokaryotic ribosomes?

70S Signup and view all the answers

How many ribosomal proteins are present in the small subunit of prokaryotic ribosomes?

21 Signup and view all the answers

Which type of ribosomes has small 30S and large 50S subunits, together forming a 80S mitoribosome?

Chloroplast ribosomes Signup and view all the answers

What is the main role of ribosomes?

Protein synthesis Signup and view all the answers

Which type of endoplasmic reticulum is involved in the metabolism of lipids and glycogen?

Smooth Endoplasmic Reticulum Signup and view all the answers

What is the diameter range of tubules in the tubular form of endoplasmic reticulum?

50 to 190 μm Signup and view all the answers

In which cells is the smooth type of endoplasmic reticulum found abundantly?

Liver cells Signup and view all the answers

What is the thickness of the membrane of the endoplasmic reticulum?

50 to 60 Å Signup and view all the answers

Which component of the endoplasmic reticulum acts as a passage for the secretory products?

Cisternae Signup and view all the answers