Which of the following bacterial pathogens is found in water distribution systems?
A) Enterobacter aerogenes
B) Klebsiella pneumoniae
C) Legionella pneumophila
D) Vibrio cholerae
Answer: C
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Explain why the presence of many Archaea has been confirmed only by community sampling of rRNA genes and not by culture in the laboratory. How has metagenomics helped to solve this problem?
What will be an ideal response?
Identical twins can result from
a. the fusion of two sets of identical gametes. b. a division of a zygote into two separate cells that develop into two separate embryos. c. the fusion of two paternal gametes with a single maternal gamete that then divides. d. a lack of chromosomal separation during meiosis resulting in gametes that are diploid and don't need to be fertilized. e. a mechanism that is not understood.
Which of the following is associated with the terms cuticle, guard cells, stomata, and trichomes?
a. ground tissue b. meristem c. vascular tissue d. dermal tissue
Imagine that the short DNA base sequence GGCTGC is transcribed and then translated by a ribosome
The following activated tRNA molecules are available in the cytoplasm: tRNA Anticodon Amino Acid GGC proline CGU alanine UGC threonine CCG glycine ACG cysteine CGG alanine What resulting dipeptide will form? A) Cysteine-alanine B) Proline-threonine C) Alanine-alanine D) Glycine-cysteine E) Threonine-glycine