The correct answer is (d.) proteins. Higher organisms use nitrogen to make their protein. Food that is containing protein also involves nitrogen in it. Protein also has amino acids that contain nitrogen in it which is a necessary essential nutrient for the body.
The ability of an organism to make a copy of itself is called Reproduction
Answer:
The correct answer is - option B. They are small because they lack a nucleus.
Explanation:
Red blood cells or erythrocytes are specialized cell that produce in bone marrow and have specific role such as carrying oxygen from lungs to deliver it to the various organs and carry out carbon dioxide.
In mammals these cells lack cell organelles such as nucleus and mitochondria, a major factor that determined its smaller size. The size of RBC are move through narrow vessels throughout a organism because of its specific size and shape that provide it space for hemoglobin and allow to be flexible and bend to move through narrow vessels.
Thus, the correct answer is : option B. They are small because they lack a nucleus.
Answer;
-Enzymes
Enzymes are class of proteins, they make metabolic reactions proceed much faster than they would have on their own.
Explanation;
-Proteins are biological macromolecules that are diverse in shape size and function. Enzymes are biological molecules (proteins) that act as catalysts and help complex reactions occur everywhere in life. They are biological catalysts.
All enzymes are proteins by definition. But not all biomolecular catalysts are proteins. Most enzymes are proteins, although a few are catalytic RNA molecules.
Two types of organelles that produce energy
