The following diagram shows two examples of pathogens - VCE - SSCE Biology - Question 2 - 2005 - Paper 1

The function of the ribosomes is to facilitate the synthesis of proteins by translating messenger RNA (mRNA) into polypeptide chains, which then fold into functional proteins necessary for various cellular processes.

The kind of pathogenic agent represented by Specimen B is a virus.

The significant feature used to distinguish a pathogenic agent from a pathogenic organism is the pathogenic agent's inability to reproduce outside a living cell. This characteristic differentiates viruses from living organisms, which can replicate independently.

The role of the mosquito in the life cycle of Wuchereria bancrofti is as a vector. It facilitates the transfer of larvae from an infected person to a host, allowing the larvae to develop and mature in the mosquito before being transmitted to another human.

One structural feature expected in the larvae that helps it survive in the human is the presence of a protective cuticle. This outer covering helps prevent the larvae from being digested and protects against the host's immune response.

Another structural feature expected in the larvae is the ability to move efficiently through bodily fluids. The larvae possess specialized adaptations, such as a streamlined body shape, that enhance their mobility in the lymphatic system.

One method that may be used to control the spread of this parasitic worm is the implementation of mosquito control programs. This can include using insecticides, releasing genetically modified mosquitoes that cannot reproduce, and reducing standing water where mosquitoes breed to minimize their populations.