They are considered to be the most primitive and are surely the first of the vertebrates?

Related Mcqs:

The experiments on DNA molecules in chromosomes for knowing the basis of inherited diseases are conducted by________?

A. Molecular biologists B. Microbiologists C. Freshwater biologists D. Social biologist...

The single healthy megaspore retained within the megasporangium germinates to form an egg containing female gaemtophyte called______________?

A. Ovule B. Seed C. Fruit D. Embroyo sac...

Conversion of ammonia or ammonium ion into nitrites during nitrogen cycle occurs due_____________?

A. Rhizobium B. Nitrosomonas C. Nitrobacter D. Pseudomonas...

Amoeboid movements and movement of cyclosis is due to_________?

A. Microfilaments B. Microtubules C. Intermediate filaments D. Cytoskeleton...

Whone is not the function of endoplasmic reticulum?

A. Nerve impulse conduction B. Transport of material C. Mechanical support D. Synthesis of conjugated molecules...