Which of the following organelles is found only in animal cells and not in most plant cells?
a) chloroplast b) mitochondrion c) lysosome d) peroxisome

C. Lysosome

Explanation:

Lysosmes are not commonly found in plants. They are mostly found in animal-like eukaryotes. Lysosomes have digestive enzymes that breakdown molecules like proteins, carbohydrates and the like. They also breakdown worn out organelles. When broken down, they exit the lysosomes in vesicles so that the cell can expel it. This is why lysosomes are called the garbbage disposal of the cell.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.