Answer:
c. Active transport
Explanation:
The differences between the different type of a substance's movement through a membrane (phospholipid bilayer) are:
<u>- Passive transport:</u> is the movement of substances across the membrane without needing ATP energy. Encompass facilitated diffusion and osmosis.
<em>Facilitated diffusion:</em> requires a transmembrane protein but the substances move in favor of their concentration gradient (this process doesn't need ATP energy).
<em>Osmosis:</em> when the molecules are not polar they can diffuse through the membrane, as long as they move in favor of their concentration gradient. So this process doesn't need transport proteins neither ATP.
<u>- Active transport:</u> polar molecules or ions require both a transmembrane transport protein and ATP energy when they move from a region of lower concentration to a one higher concentration, meaning, against the concentration gradient.
The cell wall and chlorophyll are absent in animal cells. These are unique to plant cells.
Answer: The secondary structure of protein is creates by hydrogen bonds between the hydrogen atoms on the amine group and the oxygen atom on the carboxyl group.
Explanation:
Secondary structure of protein is a three dimensional type of protein that is formed by hydrogen bonds between the hydrogen atoms on the amino group and oxygen atom on the carboxyl group. The secondary structure of protein chains are organised into two regular structures which are alpha helixes and beta pleated sheets. In alpha helix the chain is like a loosely coiled spring and beta pleated sheets, the chains are folded. Meanwhile, protein have three types of structures which are primary, secondary and Tertiary.
<span>C) DNA polymerase can join new nucleotides only to the 3' end of a growing strand. </span>