A 100 ml sample of water is filtered through a sterile membrane, and the membrane is transferred to a plate of m-Endo agar. Following overnight incubation at 37°C, 57 green metallic colonies appear. The coliform count is
A. acceptable for drinking water and recreational use.
B. too high for both drinking water and recreational use.
C. acceptable for recreational use but too high for drinking water.
Answer: C
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What do biologists use in order to identify clones that contain the DNA fragment of interest?
a. probes b. plasmids c. templates d. primers e. ligases
The citric acid cycle and glyoxylate cycle are similar in many respects. Which of the following statements accurately describes these cycles?
A) Both cycles are catabolic. B) The glyoxylate cycle has only a single decarboxylating reaction. C) In the glyoxylate cycle, two acetyl CoA molecules are used to generate succinate. D) The glyoxylate cycle is used by some organisms to synthesize proteins. E) The citric acid and glyoxylate cycles both occur in the mitochondrion.
In a multicellular organism, nerve cells are different from muscle cells because
a. each cell type has a unique set of transcription factors and repressors, so it expresses a specific set of genes b. each type of cell within a multicellular organism contains a different set of genes c. random events within each cell regulate the expression of genes and result in different genes being expressed in different cells d. cells gain and lose different genes during embryonic development, so each cell in an adult only has some genes from the original set
The HIV viral envelope protein gp120 binds to the host cell CD4 receptor.
Answer the following statement true (T) or false (F)