Answer:
Embedded in the lipid bilayer are large proteins, many of which transport ions and water-soluble molecules across the membrane. Some proteins in the plasma membrane form open pores, called membrane channels, which allow the free diffusion of ions into and out of the cell.
Answer: True
Explanation:
<u>A cell membrane consists of a lipid bilayer made of polar phosphate head and a nonpolar lipid tail.</u> It is semipermeable and regulates the transport of materials through it. For this,<u> it is selectively permeable</u> and since it is made of lipids, hydrophobic and small polar molecules can diffuse easily through it by simple diffusion and down their concentration gradient. However, polar molecules, large molecules (such as glucose) and ions are not able to pass through it because they are repelled.
To accomplish the transport of these molecules that can not diffuse, proteins embebbed in the membrane function as carriers that enable the transport of polar molecules, large molecules and ions by passive (through facilitated diffusion, down its concentration gradient) or active transport (movement against its concentration gradient).
Species A and B would be the most similar because there is only one mutation between the two of them located in the first codon.
<h2><u>
Answer:</u></h2>
<em>C. skeletal muscle; cardiac muscle, smooth muscle, and organs</em>
<h3><u>
Explanation:</u></h3>
- The somatic nervous system has voluntary control of body movements via skeletal muscles, whereas the autonomic nervous system is responsible for controlling involuntary body functions, such as heartbeat, blood flow, breathing, and digestion.
- Skeletal muscle system (SNS) regulating voluntary skeletal muscle contraction and autonomous nervous system ( ANS) regulating involuntary control of smooth, cardiac muscles and glands.
<em>Hope this helps.</em>
Answer:
Essentially there is not an answer. There are two different definitions.
A holoenzyme is an enzyme that needs to be together with a cofactor(s), required for activity.
In some cases, enzymes constituted by several subunits (like DNA polymerase 3) are call holoenzyme as well, because it will only perform correctly when all its subunits are present.
