Which of the following is not a property of B cells?
A. They require antigen presented with MHC proteins.
B. They have receptors called immunoglobulins.
C. There are low numbers circulating in the blood.
D. They mature in the bone marrow.
E. They produce plasma cells and memory cells.
Answer: A
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Which of the following is NOT photoautotrophic?
a. Cyanobacteria b. Green sulfur bacteria c. purple sulfur bacteria d. purple non-sulfur bacteria e. Cyanobacteria and purple sulfur bacteria
Which of the following statements about essential elements is FALSE?
a. An element with only one role in plant metabolism may still be essential. b. An essential element is necessary for normal growth and reproduction. c. Plant seeds in some cases contain enough of an essential element to sustain the adult plant. d. An essential element may occasionally be functionally replaced by another element. e. Some essential elements are required in only trace amounts.
Any change in allele frequencies in a gene pool is called ____
a. natural selection b. macroevolution c. microevolution d. mutation e. artificial selection
Which level of organization is common to all life forms?
A. tissue B. cell C. colony D. organ E. organelle