I think b. Proteins are polymers of amino acids is the correct answer
B.produce antibodies when triggered by antigens
C. The Bering Land Bridge once connected what would be Russia and North America but the the movement of these continents separated the land bridge
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).
Answer:
This is an example of scope creep.
Explanation:
In project management, scope creep signifies the changes, uncontrolled or continuous growth in the scope of a project, at any time after the initiation of the project. This can take place when the project's scope is not adequately documented, defined, or monitored.
The main reasons for scope creep are poor requirements analysis, underestimating the complexity of the project, not involving users early enough, and lack of change control. Thus, the given case is an illustration of scope creep.
