Question

a lichean is a fungus and a cyanobacteria living together, the term given to this relationship is a

a. marriage
b. symphysis
c. saltation
d. symbiosis
e. heteroautotroph

value: 10

pathogenic bacteria cause disease by

a. secreting toxins into the host.
b. destruction of tissue.
c. growing too rapidly for the immune system.
d. interfering with vital functions.
e. all of the choices are correct.

value: 10

cells that do not have a nucleus, or other compartmentalization are called:

a. prokaryotic
b. eukaryotic
c. plant
d. animal
e. fungal
f. all of these

Explanation:

• First question: Symbiosis is a biological relationship where two organisms live closely together. In lichens, fungi and cyanobacteria have a symbiotic relationship. Marriage is a social concept, symphysis is a type of joint in anatomy, saltation is a form of movement or a term in evolution (sudden change), and heteroautotroph is not a standard biological term for this relationship.
• Second question: Pathogenic bacteria can cause disease by multiple mechanisms. They can secrete toxins (e.g., diphtheria toxin), destroy tissue (e.g., some bacteria that cause abscesses), grow rapidly evading immune response (e.g., in some acute infections), and interfere with vital functions (e.g., by disrupting normal cell - signaling pathways). So all the options a - d are correct ways pathogenic bacteria cause disease.
• Third question: Prokaryotic cells lack a nucleus and membrane - bound organelles (compartmentalization). Eukaryotic cells have a nucleus and organelles. Plant, animal, and fungal cells are all eukaryotic.

Answer:

• First question: d. Symbiosis
• Second question: e. All of the choices are correct
• Third question: a. Prokaryotic