Mycobacterium tuberculosis is resistant to drying due to the presence of ________ in its cell wall.

A. carbohydrates
B. proteins
C. waxes
D. peptidoglycan
E. sterols


Answer: C

Biology & Microbiology

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The predominant mechanism driving cellular differentiation is the difference in gene _____

A) expression B) sequences C) order D) replication

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Chronosequences are useful because one can

A) view several taxa in one sere. B) view several seres in one region. C) measure the impacts of disturbance. D) count the number of trees in one sere.

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An example of one of the ways a pH buffer helps to maintain homeostasis is to

A. increase the OH- concentration if pH increases. B. reduce the H+ concentration if pH increases. C. reduce the H+ concentration if pH decreases. D. increase the H+ concentration if pH decreases. E. reduce the OH- concentration if pH decreases.

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Bacterial proteins were radioactively labeled and fed to phagocytic cells. The proteins within the phagocytic cell became increasingly more radioactive over time. This observation is the result of the activity of

A) mitochondria. B) chloroplasts. C) lysosomes. D) peroxisomes. E) the Golgi apparatus.

Biology & Microbiology