Which of the following statements is incorrect?
- AMicrobodies are present in both plants and animals.
- BMature sieve tube elements possess a conspicuous nucleus and usual cytoplasmic organelles.
- CThe perinuclear space forms a barrier between the materials present inside the nucleus and those of the cytoplasm.
- DNuclear pores act as passages for proteins and $RNA$ molecules in both directions between the nucleus and the cytoplasm.
Explore More
Similar Questions
Name two cell-organelles that are double membrane-bound. What are the characteristics of these two organelles? State their functions and draw labelled diagrams of both.
Difficult
View SolutionWhich of the following statements are incorrect?
$(i)$ Plant cells have centrioles which are absent in almost all animal cells.
$(ii)$ Ribosomes are the site of protein synthesis.
$(iii)$ The middle lamella is a layer mainly of calcium carbonate which holds the different neighbouring cells together.
$(iv)$ In animal cells, steroidal hormones are synthesized by smooth endoplasmic reticulum.
Of the above statements:
$(i)$ Plant cells have centrioles which are absent in almost all animal cells.
$(ii)$ Ribosomes are the site of protein synthesis.
$(iii)$ The middle lamella is a layer mainly of calcium carbonate which holds the different neighbouring cells together.
$(iv)$ In animal cells, steroidal hormones are synthesized by smooth endoplasmic reticulum.
Of the above statements:
Medium
View SolutionWhich of the following pairs represents organelles that lack a unit membrane?
Easy
View SolutionColumn-$I$ represents the organelle and Column-$II$ represents its structure. Select the correct option:
Column-$I$ Column-$II$ $(A)$ Mitochondria $(i)$ Single membrane-bound structure $(B)$ Lysosome $(ii)$ Non-membrane-bound structure $(C)$ Nucleolus $(iii)$ Double membrane-bound structure
| Column-$I$ | Column-$II$ |
| $(A)$ Mitochondria | $(i)$ Single membrane-bound structure |
| $(B)$ Lysosome | $(ii)$ Non-membrane-bound structure |
| $(C)$ Nucleolus | $(iii)$ Double membrane-bound structure |
Easy
View SolutionMatch the columns and identify the correct option.
Column $I$ Column $II$ $A$. Thylakoids $(i)$ Disc-shaped sacs in Golgi apparatus $B$. Cristae $(ii)$ Condensed structure of $DNA$ $C$. Cisternae $(iii)$ Flat membranous sacs in stroma $D$. Chromatin $(iv)$ Infoldings in mitochondria
| Column $I$ | Column $II$ |
| $A$. Thylakoids | $(i)$ Disc-shaped sacs in Golgi apparatus |
| $B$. Cristae | $(ii)$ Condensed structure of $DNA$ |
| $C$. Cisternae | $(iii)$ Flat membranous sacs in stroma |
| $D$. Chromatin | $(iv)$ Infoldings in mitochondria |
Vedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo