Which of the following structures are found in plants but not in animals? select all that apply.

cell wall
chloroplast
ribosome
golgi apparatus
lysosome

The correct answer is Cell wall and Chloroplast.

Cell wall is a protective layer around plasma membrane in the plant cells, which is mostly composed of cellulose ( a complex carbohydrate). It provides structural support, strength, protection, and appropriate shape to the cell.

Chloroplast is a specialized membrane bound organelle, which is the site for the synthesis of food ( through photosynthesis) in green plants. It contains a green pigment called chlorophyll, which helps in the absorption of light energy through a series of chemical reactions and convert it into chemical energy in the form of ATP and NADPH. This eventually helps in the formation of food in the form of a carbohydrate ( glucose) in plants.

Thus, chloroplast and cell wall are the two structures, which are found in plants but not in animals.

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

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