MCQ
Purines and pyrimidines polymerise to form:
- ANucleoside
- BNucleic acid
- CRibonucleotides
- DAll of the above
Explanation:
Nucleic acids are polymers of nucleotides.
They are formed by joining together of long chains of nucleotides.
RNA (ribonucleic acid) is a polymer of ribonucleotides and is made up of ribonucleotides joined together by phosphodiester bonds.
DNA (deoxyribonucleic acid) is a polymer of deoxyribonucleotides and is made up of deoxyribonucleotides joined together by phosphodiester bonds.
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$(I)$ In human body, it is made of number of muscle bundles.
$(II)$ Muscle bundles contains a number of muscle fibers and fiber is lined by the sarcollemma.
$(III)$ In Muscle fiber, sarcoplasm contains only one nucleus.
$(IV)$ In muscle fiber, sarcoplasmic reticulum is the store house of calcium ions.
$B$ - In pteridophyte gametophyte is multicellular,short lived and haploid
$I$. They reproduce asexually by non-motile spores and sexually by non-motile gametes
$II$. In this class, sexual reproduction is oogamous and accompanied by complex post-fertilisation developments
$III$. The common members are Polysiphonia, Porphyra, Gracilaria and Gelidium
The above characteristics are belongs to which class of algae