there can be more than one answer 19. Carbohydrates are important macromolecules
ID: 149787 • Letter: T
Question
there can be more than one answer
19. Carbohydrates are important macromolecules found in microbial cells. However, which of the following are NOT common functions of carbohydrates? A. Energy storage. B. Cell signalling C. Cell regulation. D. Structural components of the cell wall. E. Structural components of cell membranes. 20. There are important structural differences between the cell walls of organisms from the different domains of life. Which of the following are TRUE of archaeal cell walls? A. The consist of peptidoglycan. B. Glycosidic bonds are (1,3) C. Contain a paracrystalline S-layer. D. Typically contain D-amino acids. E. Some consist of polysaccharide chains of N-Acetylglucosamine (NAG) and N-Acetyltalosaminuronic acid (NAT)Explanation / Answer
19. C
Carbohydrates are important energy stores for example, glycogen in animals, starch in plants etc. So A is not the answer.
Carbohydrates present on the cell surface are recognised by sugar-specific receptors and are important in cell-cell recognition and signalling. So B is not the answer.
Carbohydrates are not particularly involved in cell regulation. So C is the answer.
Carbohydrates make up the cell wall of many organisms for example, cellulose in plant cell wall, chitin in fungal cell walls etc. So D is not the answer.
Carbohydrates are attached to proteins and lipids of cell membranes and are therefore structural components of the cell membrane. So E is not the answer.
20. B, C and E
Archaeal cell walls do not consist of peptidoglycan. So A is false.
Archael cell walls that are made of pseudomurein have N-Acetylglucosamine linked to N-Acetyltalosaminuronic acid by (1,3) glycosidic bonds. So B is true.
Almost all archaeal cell walls contain a paracrystalline S-layer. So C is true.
Archaeal cell walls are not composed of D-amino acids. So D is false.
Some archaea have cell walls made of pseudopeptidoglycan which consists of chains of N-Acetylglucosamine and N-Acetyltalosaminuronic acid. So E is true.
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