The reduction in the density of chestnut trees in North America was due to

A. a fungal pathogen.
B. chestnut blight.
C. a fungal pathogen and chestnut blight.
D. an insect.
E. a bacteria.


C. a fungal pathogen and chestnut blight.

Biology & Microbiology

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Which two of the following bacteria that are strictly anaerobic with respiratory or fermentative metabolism are most similar in physiological function?

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Due to the lack of an enzyme to break down lipids, excess accumulation of lipids in the brain leads to a human disease called Tay Sachs syndrome. Which organelle is likely to be the one that lacks the proper enzyme needed for lipid breakdown?

A. lysosome B. tonoplast C. mitochondrion D. Golgi apparatus E. peroxisome

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In aerobic respiration, what is the ultimate fate of the electrons released from the breakdown of glucose?

a. They are combined with NAD+. b. They are combined with ATP. c. They become hydrogen ions. d. They are moved through the electron transport chain. e. They are combined with oxygen and hydrogen ions to form water.

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Which of these is not a type of water pollutant?

a. dissolved oxygen. b. toxic chemicals. c. organic wastes. d. sediment.

Biology & Microbiology