A bacterial colony can be described as:
a. sufficiently large numbers of a bacterium that can be observable with the unaided eye.
b. derived from many different types of bac-terial cells.
c. belonging to different genera and species.
d. having different genetic and phenotypic characteristics.
A
The multiplication of a single bacterial cell into a heap of cells large enough to be observed with the naked eye results in a colony.
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How are the sulfur cycle and the phosphate cycle interconnected?
A. Phosphate is released from rock and soil by sulfuric acid. B. Sulfate and phosphate react together to produce amino acids for protein production. C. Sulfite is the nutrient used by phosphate reducers. D. Phosphate is the nutrient source used by sulfur oxidizers.
What kind of molecules serve as electron acceptors in cellular respiration?
A) water B) polar molecules C) molecules with high potential energy D) molecules with low potential energy E) molecules in an excited state
You are working in a cancer lab and are interested in identifying some genes that are important in the onset of lung cancer. You have several genes you think may be involved, so you "print" spots of the DNA sequences of interest on a microarray slide. After doing this, you isolate mRNA from both normal lung cells and cancerous lung cells. Before you use these mRNAs to probe the microarray slide, you need to
A. make cDNA and amplify the cDNA using PCR. B. amplify the mRNA using PCR. C. clone each mRNA into a BAC vector. D. add reverse transcriptase and fluorescent nucleotides to the mRNA to make cDNA. E. sequence the mRNA.
The reserve food in angiosperm seeds is stored in a special tissue called:
A) nectar. B) the sporophyte. C) the seed coat. D) endosperm.