According to the IUCN Red List, what group of living organisms is most greatly threatened by extinction?
A. coral reefs
B. birds
C. conifers
D. amphibians
E. mammals
Answer: D. amphibians
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Class II major histocompatibility complex molecules are found on all of the following types of cells EXCEPT ________.
A. macrophages B. red blood cells C. dendritic cells D. B cells
Which type of joints are involved in opposition?
a. saddle b. planar c. ellipsoidal d. ball-and-socket
Which of the following is the best description of an adaptation?
a. a trait that was beneficial to survival in the past b. a trait that is currently beneficial to survival c. a trait that will be beneficial in the future d. a trait that is of no advantage to survival e. an environmental change that selects for certain traits
The enzyme beta-galactosidase acts on lactose to form galactose. In turn, the presence of galactose leads to expression of the enzymes responsible for the metabolism of galactose. In this case, lactose is serving as a carbon source and as a(n)
A. DNA-binding protein. B. inducer. C. repressor. D. operon.