Author: Anonymous

Does this image represent a pure culture?

Treating the work area with disinfectant will kill all forms of microbes.

Petri dishes should be incubated with the lid side up.

An agar plate that has colonies demonstrating multiple different morphologies is most likely a pure culture.

What term is used to describe the cloudiness produced by bacterial growth in a tube of broth?

Which of the following is the correct order of steps needed to aseptically inoculate an agar plate from a broth culture?

Observation of a broth after transfer can show whether or not contamination has occurred

You are a research assistant in a lab that studies nucleic acids. Your advisor gave you four tubes for analysis. Each of these tubes differs in its contents by the source of its nucleic acids: mouse cytoplasm (single-stranded RNA), yeast nuclei (double-stranded DNA), rotavirus (double-stranded RNA), and parvovirus (single-stranded DNA). The approximate nucleotide base composition of each sample is given in the table below. Tube A C U T G 1 32 17 0 32 19 2 34 16 15 0 35 3 30 21 0 23 26 4 33 16 34 0 17 Which tube most likely contains yeast nuclei?

Which of the following is NOT necessary for RNA polymerase to recognize the promoter of a bacterial gene?

Below is the sequence of the non-template strand of DNA downstream of the transcription start site of a eukaryotic gene transcribed by RNA polymerase II. Determine the mRNA sequence encoded by the template DNA.5′-ctagccatggggtcgacggcggagg- 3′