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प्रश्न
When we talk of functional macromolecules (e.g. proteins as enzymes, hormones, receptors, antibodies etc), towards what are they evolving?
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उत्तर
Functional macromolecules are evolving towards creation of a complex organims. There are various evidence that are common to simple and complex forms of lite indicate common ancestry, e.g., histones protein tend to be well preserved among all eukaryotes, from amoebas to blue whale or to humans, with only one or two amino acids different.
The genetic code is nearly identical for all known life forms, from bacteria to archaea or animal and plants.
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संबंधित प्रश्न
Using various resources such as your school library or the internet and discussions with your teacher, trace the evolutionary stages of any one animal say horse.
Ancestral amphibians were tetrapods that evolved during:
Two organisms occupying a particular geographical area (say desert) show similar adaptive strategies. Taking examples, describe the phenomenon.
Practise drawing various animals and plants.
Match List I with List II.
| List I | List II |
| A. Mesozoic Era | I. Lower invertebrates |
| B. Proterozoic Era | II. Fish & Amphibia |
| C. Cenozoic Era | III. Birds & Reptiles |
| D. Paleozoic Era | IV. Mammals |
Choose the correct answer from the options given below:
When did the first cellular forms of life appear on Earth?
Which of the following early cell types contributed to the development of multicellular organisms?
Approximately how long ago did invertebrates exist in aquatic environments?
When did some fish lineages develop the ability to move onto land?
What major survival advantage did thick-shelled eggs provide to reptiles?
For approximately how many years did reptiles dominate the Earth?
Which of the following is an example of a reptile that returned to the water about 200 mya?
When did dinosaurs disappear from the Earth?
What possible explanation is given for the sudden extinction of dinosaurs?
How did the extinction of dinosaurs affect the evolution of mammals?
Which of the following best describes early mammals?
What characteristic makes Tyrannosaurus rex notable among land reptiles?
