Answer:
Transport proteins allows only enzymes to pass through the membrane
Explanation:
Humans store excess polysaccharides in the form of glycogen.
Polysaccharides are carbohydrates. They are generally used to generate energy in the form of ATP for the body's metabolic activities.
Carbohydrates are broken down during respiration to generate energy. Excess carbohydrates are generally converted to glycogen through the actions of an enzyme in the liver.
Glycogens are converted back to simpler carbohydrates when there is inadequate carbohydrate in the body.
More on carbohydrate homeostasis can be found here: brainly.com/question/17563062?referrer=searchResults
Before assessing the two given cases, an assumption needs to be made about the digestion of the two types of food items, corn and beef. Let us assume that both get digested by expending same amount of energy by the human body. Let the amount of energy at producer level be an arbitrary X.
Case 1: Corn to human:
Since corn is at the producer level, it will have X amount of energy. The transfer of energy from corn to human will take place with a loss of 90% energy at the producer level. Hence the humans will receive 10% of X amount of energy.
Case 2: Corn to cow to human:
Since corn has X amount of energy, only 10% will pass to the next level, i.e. cow. So cow has 10% of X. Cow transfers only 10% of the energy that it has. Hence humans receive only 10% of 10% of X amount of energy.
It can be seen that humans receive more energy in case 1 than case 2. Hence we can say that it is more efficient for humans to feed on corn.
Answer:
Lipids are hydrocarbon molecules that make up the structure of living beings. Few examples are <u>fats, oils and waxes</u>. Steroids are also a class of lipids but they are not structurally related to other lipids but do share some common properties with them. They are <em>insoluble in water and are hydrophobic</em>( water-repelling).
Explanation:
Lipids are insoluble in water as they are <em>non-polar</em> but soluble in non polar solvents (<em>chloroform</em>). Fat soluble vitamins like <u>A,D,E,K and steroids</u> have a different structure composed of fused four rings.
The most common example of steroid is cholesterol. Cholesterol acts as a precursor for many hormones and other signalling molecules.
The B cells are not considered as first line defense structures of the immune’s system
Answer: Option C
<u>Explanation:</u>
Our body is protected internally by nature by many layers of defense. Any microbe or a foreign material that disturbs the body is defended by these barriers.
The first layer of defense required physical and chemical barrier such as the skin, mucous membrane, tears, saliva etc . The second line defense system involves the cells and the tissues that protect the body.
