In the formation of ectomycorrhizae, a single tree can form associations with
a. a single fungal species in the soil.
b. a single bacterial species in the soiI.
c. multiple bacterial species in the soil.
d. multiple fungal species in the soil.
Answer: D
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A positive Biuret test indicates the presence of
A. proteins B. carbohydrates C. fats D. nucleic acids
Of the 20 standard amino acids, only ___________ is not optically active. The reason is that its side chain ___________.
A) alanine; is a simple methyl group B) glycine; is a hydrogen atom C) glycine; is unbranched D) lysine; contains only nitrogen E) proline; forms a covalent bond with the amino group
These bind to receptors initiating a signal causing metastasis
a. phosphatases b. kinases c. ligands d. cytoplasmic proteins
Which of the following statements about generalized transduction is false?
A. Generalized transduction always involves lytic phage. B. "Headfull" packaging always places only phage DNA into the phage head during phage packaging in generalized transduction. C. Generalized transduction can be used to map bacterial genes. D. Two recombination events are necessary to integrate the transferred DNA during generalized transduction. E. Genes that are close together on the bacterial chromosome will have a relatively large cotransduction frequency.