Answer:
b. Proteins
Explanation:
Several transmembrane proteins serve as transport proteins and move charged, polar and large substances such as ions, amino acids, sugars through membranes. These are the carrier proteins and channel proteins. Each type of transport protein transports a specific type of substance. Carrier proteins bind the ion or molecule and undergo changes in shape. This change moves the molecule across the membrane. Channel proteins form pores through the membrane to allow transport of substances.
For example, aquaporins are transmembrane proteins that allow water to pass through membranes.
An ecological niche refers to an organism's specific behavior in its specific ecosystem.
There are many things that fall under this description. For example, by specifying an ecological niche, we could be talking about the behavior an organism is exhibiting when there is plenty of resources or when the resources in a certain ecosystem are scarce. This has to be taken in account together with the question whether he has to compete with other organisms in his ecosystem for those resources.
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Answer:
A skeletal muscle fiber is surrounded by a plasma membrane called the sarcolemma, which contains sarcoplasm, the cytoplasm of muscle cells.
Explanation:
Answer:
<em>The correct option is C) High standards of journalism set by their newspapers</em>
Explanation:
William Randolph Hearst and Joseph Pulitzer were the leading newspaper owners of the 1890's who used melodrama, romance etc to expand the business of newspapers. Their style of newspapers came to be known as the yellow journalism. William Randolph Hearst and Joseph Pulitzer saw the conflict of the Spanish American War as a way to sell newspapers. However, many other journalists such as Frank Luther Mott identified yellow journalism to promote fake headlines and parade of false learning.