Chlamydia is a sexually transmitted disease that is caused by a bacterium called Chlamydia trachomatis.

Question

Which of these are characteristics of the infectious agent that causes chlamydia?

a
Non-living particle that contains DNA
b
Unicellular organism that replicates only inside of other organisms
c
Nonliving particle that replicates only inside of other organisms
d
Unicellular organism that contains DNA

Answer 1

The correct characteristics of the infectious agent that causes chlamydia (Chlamydia trachomatis) are:

b. Unicellular organism that replicates only inside of other organisms
d. Unicellular organism that contains DNA

Chlamydia trachomatis is a bacterium, which means it is a unicellular organism, and it indeed replicates within host cells (intracellular). Additionally, it contains DNA, characteristic of living cells.

Options a and c describe viruses or non-living particles, which do not apply to Chlamydia trachomatis.