<u>Answer:</u>
Recent evidence suggest that feathers evolved from scales and suggest that 'feathers and pycnofibers' could be homologous.
<u>Explanation:</u>
- One of the major difficult issue related to bird evolution is the evolution of feathers.
- Feathers are considered as the most 'complex integumentary structures' which are found in vertebrates.
- Evolutionary developmental biology suggests that the 'planar scale structure' is been modified for developing into feathers by 'splitting' to form web like structures.
- Scales and Feathers consist of 'two distinct form of keratin' so it was thought that 'each type was exclusive skin structure' but recent study suggests that they are developmental expressions of same skin structures.
Answer:
Proteins play a fundamental role for life and are the most versatile and diverse biomolecules. They are essential for the growth of the organism and perform a huge amount of different functions.
The passage of DNA to proteins begins with the step of transforming genetic information into an intermediary between DNA and protein. This intermediary is called messenger RNA (mRNA). The difference between DNA and mRNA is that the second corresponds to a very small fraction of all DNA, consists of a single chain (it is no longer a “zipper” but a strand), and that Thymine (T) is replaced by the Uracil (U). This fraction corresponds to the stretch of DNA that contains the sequence necessary to ultimately synthesize the protein.
Answer:
D.4
Explanation:
It contains a carbon atom that bonds to six other atoms instead of the four we have been told carbon is limited to. Atoms form molecules by sharing electrons. Carbon has four electrons that it can share with other atoms
Answer:
Biological predispositions
Explanation:
A Biological Predisposition is an expanded possibility of building up an infection or example of conduct dependent on the qualities we acquired from our folks (and our's folks). Qualities impact our character attributes, our IQ, our probability of getting malignant growth, and even our odds of turning into a heavy drinker.
Being predisposed to a turmoil doesn't imply that we will create it, just that we are progressively powerless against it dependent on our hereditary cosmetics. Natural hazard variables join with ecological factors, for example, stress or diet to trigger a confusion.
Research studies utilizing twins have demonstrated that numerous attributes and disarranges are heritable. For instance, in indistinguishable twin sets, on the off chance that one twin is determined to have schizophrenia, there is a half shot that the other twin will likewise be analyzed. Be that as it may, in congenial twin matches, this rate is just 15%. Since indistinguishable twins share a larger number of qualities than brotherly twins, we can infer that schizophrenia has an acquired organic premise.
