Ques: Q: The hydroxyl radical is highly reactive because it has what? Read this paragraph and choose the correct option from the provided answers: Because the hydroxyl radical has an unpaired electron, it is highly reactive. (This is true of any substance with unpaired electrons, known as a free radical. ) This hydroxyl radical can react with all kinds of biological molecules (DNA, proteins, enzymes, and so on), causing damage to the molecules and disrupting physiological processes. Examples of direct and indirect damage are shown in Figure 21.32. Choices: - unpaired neutron - paired proton - paired electron - unpaired electron A:
Ans: unpaired electron

Ques: Q: Deposition also occurs when a stream or river empties into a large body of what? Read this paragraph and choose the correct option from the provided answers: Deposition also occurs when a stream or river empties into a large body of still water. In this case, a delta forms. A delta is shaped like a triangle. It spreads out into the body of water. An example is pictured below ( Figure above ). Choices: - even water - homogeneous water - calm water - still water A:
Ans: still water

Ques: Q: What does the ground tissue consist mostly of in the stems of both monocots and eudicots? Read this paragraph and choose the correct option from the provided answers: Choices: - hinterrhein cells - eudiocotic cells - epenthesis cells - parenchyma cells A:
Ans: parenchyma cells

Ques: Q: What is formed when amino acids are linked together in a long chain? Read this paragraph and choose the correct option from the provided answers: Many amino acids can be linked together to form a long chain known as a protein . These linkages are formed when the carboxylic acid of one amino acid reacts with the amine of another to produce an amide (see Figure below ). Choices: - amino acid - hormones - water molecule - protein A:
Ans:
protein