Each of the following statements concerning peptidoglycan is correct EXCEPT:

A. It has a backbone composed of alternating units of N-acetylmuramic acid and Nacetylglucoseamine
B. It Cross-links between the tetrapeptides involve D-alanine
C. It can be degraded by lysozyme
D. It is thinner in gram-positive than in Gram-negative bacteria


Ans: D. It is thinner in gram-positive than in Gram-negative bacteria

Biology & Microbiology

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An enzyme is what type of macromolecule?

a. carbohydrate b. protein c. lipid d. element

Biology & Microbiology

Which of the following statements is false?

a. The axons of ganglion cells form the optic nerves that carry information to the brain. b. The axons of the optic nerves end in the lateral geniculate nuclei of the thalamus. c. Integration of visual information takes place in the frontal lobes of the cerebrum. d. Neurons in the reticular activating system are involved in visual integration. e. The optic nerves cross to form the optic chiasm

Biology & Microbiology

Migration only occurs in vertebrates.

Answer the following statement true (T) or false (F)

Biology & Microbiology

________ is the most abundant class of antibodies in serum.

What will be an ideal response?

Biology & Microbiology