The release of excess nitrogen into the environment when certain complex organic substrates are used to make new microbial biomass is called ________.

A. mineralization
B. denitrification
C. nitrification
D. dissimilation


Answer: A

Biology & Microbiology

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You are genetic counselor, and a couple comes to you with concerns that if they have a child together, he or she could

have sickle-cell anemia. Genetic tests reveal that both the man and woman are carriers for sickle-cell anemia. How should you advise them?

a. Half of their children will have sickle-cell anemia, and the other half will be carriers. b. All of their children will have sickle-cell anemia. c. There are no concerns, because none of their offspring have a chance of inheriting the sickle-cell allele. d. While none of their children will have sickle-cell anemia, each child will have a 50% chance of being a carrier. e. All of their children will have a 25% chance of having sickle-cell anemia.

Biology & Microbiology

A goiter is caused by a deficiency in

a. thyroxine. b. triiodothyronine. c. calcium. d. iodine. e. both thyroxine and triiodothyronine

Biology & Microbiology

These creatures are heterotrophs with restricted mobility, have cell walls made up of cellulose, and carry out normal mitosis.

A. euglenoids B. sporozoans C. fungi D. molds

Biology & Microbiology

When macrophages migrate to the skin and remain there, they are called ________ cells.

A. GALT B. Kupffer C. alveolar D. Langerhans E. dendritic

Biology & Microbiology