19. which of the following accurately describes a characteristic of fungi?
a. parasitic fungi are responsible for benefits to plants. b. parasitic fungi often form symbiotic relationships with algae to form lichens. end of exam c. mutualistic fungi form symbiotic relationships with plants to form mycorrhizae. d. mutualistic fungi are responsible for producing some human diseases.

C. Mutualistic fungi form symbiotic relationships with plants to form mycorrhizae.

Explanation:

Fungi are eukaryotic organisms made up of masses of hyphae called mycelium. Fungi exists in different forms ranging from parasitic ones that cause harm to other organisms to the mutualistic ones whose activities benefits other organisms. According to the question, a good example of a mutualistic fungi is the one that forms mycorrhizae with plants.

Mycorrhizae is the term used to describe the symbiotic association of a fungi and a plant. The relationship is mutualistic in the sense that both organisms benefits. The plants provide food (sugar) for the fungi, which they make via photosynthesis and the fungi helps absorb water and nutrients from the soil.

Therefore, option C suits the best characteristics of a fungi.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products