MCQ
The viruses contain:
- AProteins only
- BDNA only
- CNucleic acids only
- DProteins, DNA or RNA (nucleic acids)
Explanation:
Viruses are ultramicroscopic and can cause diseases in plants and animals.
They are very simple in their structure.
They are composed of nucleic acid surrounded by a protein coat.
The nucleic acid can be either RNA or DNA, but never both.
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List $I$ List $II$
$a$.Lysosome $1$.Bacteria without cell walls
$b$.Mycoplasma $2$.A virus that infects bacterial cells
$c$.Thylakoid $3$.Flattened sacs in a chloroplast
$d$.Bacteriophage $4$.A vesicle in which hydrolytic enzymes are stored
Code :
| Column-$I$ | Column-$II$ |
| $A$. Tonoplast | $I$. Contain digestive enzyme |
| $B$. Contractile vacuole | $II$. Store metabolic gases |
| $C$. Food vacuole | $III$. Excretion |
| $D$. Air vacuole | $IV$. Transport of ions in plants |