Question

question 21
bacterial cell walls are made rigid by the presence of.
a phosphates.
b lipids.
c peptidoglycan.
d cholesterol.
e glycerol.
question 22
evidence in support of the endosymbiosis hypothesis includes all of the following except.
a mitochondria and chloroplasts are the same size as bacteria.
b mitochondria and chloroplasts have cell walls like bacteria.
c mitochondria and chloroplasts divide in a manner similar to bacteria.
d mitochondria and chloroplasts have circular dna like bacteria.
e mitochondria and chloroplasts have ribosomes that are similar to bacteria.

Explanation:

For the first question, peptidoglycan is a major component that gives rigidity to bacterial cell - walls. Phosphates, lipids, cholesterol, and glycerol do not play this role in bacterial cell - walls.
For the second question, mitochondria and chloroplasts do not have cell walls like bacteria. The other options (size, division manner, circular DNA, and ribosome similarity) are evidence supporting the endosymbiosis hypothesis.

Answer:

Question 21: C. peptidoglycan
Question 22: B. mitochondria and chloroplasts have cell walls like bacteria