1 Instead of a cell wall eukaryotic cells have an extracellu

1) Instead of a cell wall, eukaryotic cells have an extracellular matrix for structural support.

a) It is true that animal and plant cells have an extracellular matrix for support instead of a cell wall, but this is not true of all eukaryotic cells. Algae and fungi are eukaryotic cells that do have cell walls, which provide support.

b) It is true that plant cells have an extracellular matrix for support instead of a cell wall, but this is not true of all eukaryotic cells. Animals, algae, and fungi are eukaryotic cells that do have cell walls, which provide support.

c) It is true that animal, plant, and fungal cells have an extracellular matrix for support instead of a cell wall, but this is not true of all eukaryotic cells. Algae are eukaryotic cells that do have cell walls, which provide support.

d) It is true that animal cells have an extracellular matrix for support instead of a cell wall, but this is not true of all eukaryotic cells. Plants, algae, and fungi are eukaryotic cells that do have cell walls, which provide support.

2) All the ribosomes found in a typical human muscle cell are identical.

a) In a typical human muscle cell, the cytoplasmic ribosomes are either eukaryotic or prokaryotic, and the mitochondrial ribosomes are the prokaryotic type only.

b) In a typical human muscle cell, the cytoplasmic ribosomes are the prokaryotic type, and the mitochondrial ribosomes are the eukaryotic type.

c) In a typical human muscle cell, the cytoplasmic ribosomes are either eukaryotic or prokaryotic, and the mitochondrial ribosomes are the eukaryotic type only.

d) In a typical human muscle cell, the cytoplasmic ribosomes are the eukaryotic type, and the mitochondrial ribosomes are the prokaryotic type.

Solution

1. Animal cell- no cell wall but has extracellular matrix for support, plant,bacteria, fungi and algae- have cell walls which give shape and support to cell. so , the answer is D.- It is true that animal cells have an extracellular matrix for support instead of a cell wall, but this is not true of all eukaryotic cells. Plants, algae, and fungi are eukaryotic cells that do have cell walls, which provide support.

2. Eukaryotic ribosomes are different from prokaryotic ribosomes in size and composition. eukaryotic ribosomes have more RNA and ribosomal proteins and large in size. bur mitochondrial ribosomes are similar to prokaryotic ribosomes. the answer is d- In a typical human muscle cell, the cytoplasmic ribosomes are the eukaryotic type, and the mitochondrial ribosomes are the prokaryotic type