Answer:
<u>d. Transport proteins within the membrane serve as a tunnel for molecules to enter the cell.
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Explanation:
Solutes are typically moved across the cell through either passive or active transport. The cells, surrounded by a bilipid layer or plasma membrane is amphiphlic- its polar, hydrophilic lipid heads face outwards, while their non-polar hydrophobic lipid tails face inwards towards each other.
While lipid-soluble molecules move across the layer easily, it is also difficult for charged and also large molecules to move across its surface, into the cell. Transmembrane channels, <u>embedded within the membrane</u>, help to maintain selective permeability as transport proteins, pores and gated channels. Simple diffusion happens as a method of passive transport in cells through plasma membranes.
The solutes travel through the plasma membrane in the process of diffusion from regions of high concentration to regions of low concentration; this occurs without the use of energy. <u>Molecules moving against their concentration require active transport mechanism to cross the membrane</u>.
I know why farmers use fertilizers..... to provide nutrition for the plant
Answer:
The difference is due to the succeeding vowel sound strength (whether it is weak or strong)
Explanation:
"ch" produces "k" like sound. Whenever , alphabet "c" with in any word comes before any weak vowel sound such as i or e , it always sound as "ch".
Therefore, c and ch in gioco and giochi are sound similar.
"sc" sounds like "sh" when it comes before any weak vowel sound (as in the case of capisci)
"sc" sounds like "sk" when it comes before any strong vowel sound (as in the case of capisco)
Answer: All of these
Explanation:
The polymerase chain reaction (PCR) revolutionized the field of molecular biology because PCR uses a small amount of DNA as a template.Paired with two primers which side to the target sequence, nucleotides, and thermostable DNA polymerase amplifies a specific region of DNA. In this way a large amount of DNA is obtained from a very small sample.