Which of the following is not a common feature of binary fission and mitotic cell division?
A. cellular growth
B. DNA synthesis
C. pinching of the parent cell into two
daughter cells by the cytoskeleton or
cytoskeleton-like proteins
D. construction of a nuclear envelope
D
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A public health microbiologist plans to screen a particular bacterial species that was isolated from several patients in an intensive care unit to detect if any of the cells are penicillin-resistant mutants. What is the first step in conducting this experiment?
A. Set up an Ames test to see if any of the isolates are mutagenic. B. Determine whether or not wild type cells of the same bacterial species are susceptible to penicillin. C. Test the cells to see if they can grow on media to which penicillin has been added. D. Perform an antibiotic susceptibility test on the cells using antibiotics other than penicillin that are known to be effective.
From what food source do most of the calories in a typical American diet come?
A) meat B) cereal grains C) legumes D) plant leaves
Which of the following accurately describes transcriptional control of gene expression in eukaryotes?
a. Activators trigger sequences of DNA transcription factors to be expressed b. Dependent on interactions of mRNA sequences with ribosomes c. Promoters help transcription factors bind to RNA polymerases d. Transcription factors help RNA polymerase bind to promoter sequences
Explain how the composition of breast milk compared with formula affects the microbiota of infants.
What will be an ideal response?