A relatively small blood pressure gradient is generally insufficient to move blood through the veins under given conditions, thus venous return must be facilitated by valves within veins and two "pumps." ... As skeletal muscles contract, veins are squeezed to help propel the blood toward the heart.
A. True
variation of reproduction produces diverse life forms and allows organisms to evolve complex characteristics over billions of years.
The best and most correct answer among the choices provided by your question is the fourth choice or letter D.
In line with other previous and contemporaneous proposals, in 1912 the meteorologist Alfred Wegener<span> amply described what he called continental drift, expanded in his 1915 book The Origin of Continents and Oceans and the scientific debate started that would end up fifty years later in the theory of plate tectonics.</span>
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Answer:
Deletion of a DNA base from a gene affects an organism by changing the sequence of amino acids in a protein.
Explanation:
A DNA fragment forms a gene, with a specific sequence of nitrogenous bases, which determines the synthesis of a specific protein. When a deletion of a base occurs in such a gene, it affects:
- Transcription of the mRNA, which will have the sequence of altered bases.
- During translation, the mRNA codons will encode at least one different amino acid.
- The structure of the synthesized protein, which will be altered by changes in its amino acid sequence.
In summary, the <u>deletion of a base in the DNA</u><u> will affect the </u><u>protein</u><u> to be synthesized by </u><u>changing the amino acid sequence</u><u> of its structure</u>.
The other options are not possible, because the deletion of a base in the DNA of a gene
<em> Does not influence the number of chromosomes that the gametes will have.
</em>
<em> It does not produce long chains in the chromosomes.
</em>
<em> It does not affect the ribose structure of the nucleic acids.</em>
Osmosis refers to the transfer of water across a membrane and pressure of water inside plant cells is called turgor pressure. Osmosis causes cells to lose or gain water, which means it can increase or decrease the turgor pressure inside the cells. When the concentration of water available outside the cell is higher than inside, plant cell will gain water. When it's the other way around, the plant cells lose water.
