Question

question 15 (1 point)
which of the following statements about archaea is false?
they lack peptidoglycans in their cell walls.
they are prokaryotes.
some are thermoacidophiles, others are extreme halophiles
they evolved before bacteria.
some produce methane from carbon dioxide and hydrogen.

question 16 (1 point)
which of the following statements about the classical pathway of complement activation is false?
c3b cause opsonization
cleaved fragments of some of the proteins act to increase inflammation
c is not involved in the classical pathway
c1 is the first protein activated in the classical pathway

Explanation:

Question 15

• Archaea lack peptidoglycan in cell walls (true).
• Archaea are prokaryotes (true).
• Archaea include thermoacidophiles and extreme halophiles (true).
• Archaea and bacteria evolved around the same time, and there's no evidence archaea evolved before bacteria (false statement).
• Some archaea produce methane from CO₂ and H₂ (true).

• C3b is involved in opsonization (true).
• Cleaved complement proteins can increase inflammation (true).
• The classical pathway involves complement proteins (C), so "C is not involved" is false.
• C1 is the first activated in classical pathway (true).

Answer:

The statement "They evolved before bacteria" is false. So the option is: They evolved before bacteria.

Question 16