Answer:
Following are the evidences that support human evolution by natural selection:
i) Biogeography
ii)The fossil record
iii) Molecular Biology
Explanation:
i) Biogeography: it was the geographical distribution of species that was first suggested the idea of evolution to Darwin.
ii) The fossil Record: The succession of fossil forms is strong evidence in a favor of evolution. It provides a visual record in a complete series showing the evolution of an organism.
iii) Molecular biology: Evolutionary relationships among species are reflected in their DNA and proteins, in their genes and gene products.
Answer:
D) mRNA
Explanation:
In mRNA, genetic information is written from four letters, which correspond to the nitrogenous bases. This is called ogenated codon; A, C, G and U, forming long sequences of triplets. In mRNA, each of these consecutive, non-overlapping triplets is called the codon, which undergoes transient binding to the complementary aminoacyl-tRNA within the ribosome insertion sites during the translation process to establish initiation, elongation, and completion of polypeptide formation, plus a punctuation symbol.
When something needs to be transported against its concentration gradient, or a molecule is too big to simply diffuse through a membrane, active transport has to be used. So active transport requires energy (ATP).
Examples:
1. Antiport pumps: transport one substance in one direction while transporting another substance the other way. An example of this is the sodium-potassium pump.
2. Symport pumps - uses a substance that wants to move from an area of high concentration to low concentration and carries another substance against its concentration gradient. An example of this is the sodium-glucose transport protein
3. Endocytosis - large amounts of extra cellular fluid can be taken into a cell - needs ATP to bind proteins in the cell membrane and causes them to change their shape...which eventually causes the surrounding of the fluid to be brought in (a vesicle).
4.exocytosis - opposite of above
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<span>The Elements are combined to form a compound by a chemical change. Chemical changes are structural changes. The properties of things are changed when there is structure is changed. That is why elements differ from their compounds.</span>
