Answer:
Dr. Kettlebell predicted that clean forests would have light peppered colored moths, and polluted forest would have dark peppered colored moths.
Explanation:
Kettlewell thought that if natural selection caused the change in moth population.
Dark moths resting on light trees were more likely to be eaten by birds then light moths.
Answer:
The intermediate density band is observed.
Explanation:
Messelson and Sthal's explained the model of semi conservative nature of DNA replication. According to this model, the newly synthesized DNA molecule contains one newly synthesized strand and one parental strand.
Firstly, bacteria grown in 15N media is transferred to 14N media. The isolated DNA is centrifuged and intermediate density DNA band is observed that contains one strand of 15N (parental strand) and one strand of 14N (newly synthesized strand).
Answer:
- Numerous amino acids <u>allow for proteins to perform many diverse functions in organisms</u>.
- The branching structure of some carbohydrates <u>maximize the amount of glucose available for quick energy</u>.
Explanation:
Amino acids are the <u>building blocks</u> of proteins. In humans, <u>all forms of proteins</u> are made up of <u>20 different types of amino acids</u>. The <u>sequence of amino acids</u> is the key to the production of <u>specific proteins</u>. If the sequence is changed, the target protein will be changed. So, only 20 types of amino acids can produce millions of proteins through different combinations. For example, for a protein with 4 amino acids sequence, 160,000 types of polypeptide chains can be formed (20 X 20 X 20 X 20). Since we know that proteins are key players in cell functioning, their multiple combinations lead to diverse functions in the organisms.
Carbohydrates are an <u>excellent source of energy</u>. Although branching decreases the water solubility of carbohydrates, it <u>compacts the energy-yielding monomers</u> in a <u>small space</u> so that they can be <u>stored</u> and, during starvation, they can produce an <u>extensive amount of energy</u> for long term survival. Carbohydrates in <u>animal and plant</u> bodies are stored as branched structures of <u>glycogen and starch</u>, respectively.
