Nucleus is absent in

(1)erythrocytes of mammals

(2)sieve tube cells of Vascular plants

(3)Both A and B

(4)Companion cells of vascular bundle

Which of the following is true about nucleolus?

(1)membrane less structure

(2)active site for rRNA synthesis

(3)numerous in cells which are involved in protein synthesis

(4)All of the above

Which of the following is true about chromosome

(1)nucleoprotein

(2)23 pairs in single human diploid cell

(3)Contains primary constriction

(4)All of these

On what basis chromosomes have been divided into four classes.

(1)position of centromere

(2)position of primary constriction

(3)number of kinetochores

(4)Both A and B

In which of the chromosomes two equal arms are present

(1)sub-metacentric chromosome

(2)metacentric chromosome

(3)acrocentric chromosome

(4)telocentric chromosome

Satellite body is formed in chromosome because of

(1)primary constriction

(2)secondary constriction

(3)Centromere

(4)Both A and C

Through the nuclear pore the movement of _____and ______takes place

(1)RNA and proteins

(2)DNA and RNA

(3)DNA and proteins

(4)RNA and carbohydrates

Chromatin can be observed in

(1)Interphase nucleus

(2)dividing nucleus

(3)Both A and B

(4)Nuclei of any stage

Chromatin can be stained with

(1)Basic dyes

(2)neutral dyes

(3)acidic dyes

(4)Crystal violet

A number of organised flattened membranous sacs are called

(1)thylakoids

(2)starch granules

(3)Quantasomes

(4)None of these