Functions of the glycocalyx include all of the following EXCEPT
A) increased virulence.
B) binary fission.
C) source of nutrition.
D) biofilm formation.
E) protection against dehydration.
The Correct Answer and Explanation is:
The correct answer is B) binary fission.
Explanation:
The glycocalyx is a layer of carbohydrates and glycoproteins that coats the outside of many cells, particularly in bacteria. It plays several crucial roles in cellular function and survival, but binary fission is not one of them. Here’s a detailed explanation of the functions listed in the options:
- Increased Virulence (A):
- The glycocalyx plays a critical role in enhancing the virulence (ability to cause disease) of certain bacteria. By forming a sticky, protective coating around bacterial cells, it helps the pathogen evade the host’s immune system. This shielding effect makes it difficult for immune cells, like phagocytes, to engulf and destroy the bacteria. Additionally, the glycocalyx can help bacteria adhere to surfaces, making infections more persistent and difficult to treat.
- Binary Fission (B):
- Binary fission is the process by which prokaryotic cells (like bacteria) reproduce. It involves the division of a single cell into two genetically identical daughter cells. The glycocalyx does not play a direct role in binary fission. Rather, it functions in cellular interactions and protection. The process of binary fission is driven by the cell’s internal mechanisms, like DNA replication and cell division, rather than external structures like the glycocalyx.
- Source of Nutrition (C):
- The glycocalyx can serve as a source of nutrition for bacteria. It contains sugars and other molecules that can be metabolized by the bacteria. This is especially important in environments where nutrients are scarce. The glycocalyx can store energy and be used as a reservoir for resources when needed.
- Biofilm Formation (D):
- The glycocalyx is essential in the formation of biofilms. A biofilm is a community of microorganisms that adhere to surfaces and are encased in a self-produced matrix of extracellular polymeric substances (EPS), which includes the glycocalyx. Biofilms contribute to bacterial resistance to antibiotics and other harsh conditions, providing bacteria with protection and enhancing their survival.
- Protection Against Dehydration (E):
- The glycocalyx helps protect bacteria from environmental stress, including dehydration. Its thick, sticky nature retains moisture around the cell, which helps the cell survive in dry conditions. This protective feature is especially important for bacteria in harsh environments.
In summary, while the glycocalyx has several important functions related to protection, virulence, and biofilm formation, binary fission is a cellular reproduction process that does not directly involve the glycocalyx.