Antibodies ________
A) are shaped like the letter B
B) are generalists in that any antibody can bind to any antigen
C) assist in destroying particular antigens
D) are produced by T cells
C
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Birds utilize countercurrent mechanisms to optimize diffusion of O2 across their respiratory surfaces
Indicate whether the statement is true or false.
Saturated fatty acids _____
A) have double bonds between carbon atoms of the fatty acids B) are the principal molecules in lard and butter C) are usually liquid at room temperature D) are usually produced by plants
Which has an unusual characteristic in that their circular DNA does not have genes for making the proteins needed to
replicate and produce new viruses? a. viroid b. retroviruses c. bacteriophages d. pandoraviruses e. polydnaviruses
In order to assess the species diversity of a community, you would need to know the number of different species present as well as ________
A) the number of trophic levels in the community B) the intensity of interspecific competition in the community C) the fraction of these species that are plants D) the relative abundance of the different species