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
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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.
A goiter is caused by a deficiency in
a. thyroxine. b. triiodothyronine. c. calcium. d. iodine. e. both thyroxine and triiodothyronine
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
When macrophages migrate to the skin and remain there, they are called ________ cells.
A. GALT B. Kupffer C. alveolar D. Langerhans E. dendritic