Natural killer cells specifically kill which of the following?
A. Foreign transplanted tissue
B. Tumor cells and cells infected by microorganisms
C. Gram-positive bacteria
D. Fungi and protozoa
Answer: B
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Microbes such as Geobacter metallireducens obtain energy from organic matter under anaerobic conditions by using ferric iron as a(n) ________.
Fill in the blank(s) with the appropriate word(s).
In the United States, purple loosestrife, Japanese and Amur honeysuckle, Australian Melaleuca, and Brazilian pepper are all:
A) native flowering plants nearly brought to extinction by consumption by exotic insects. B) native flowering plants nearly brought to extinction by competition from exotic plants. C) exotic flowering plants that have caused relatively few problems for native species. D) exotic flowering plants that have caused significant problems for native species.
Genotypic and allele frequencies for a gene that determines neck length in giraffes are measured and found to be identical in three successive generations. From this data it is reasonable to conclude that, with respect to the gene for neck length, the population is in Hardy-Weinberg equilibrium.
a. true b. false
A pure culture is composed of cells that arise from a single (cell/inoculum/sample)
What will be an ideal response?