One of the most straightforward ways of detecting the presence of bacteria in food is to use ________.
A) a standard plate count
B) spectrophotometry
C) staining
A) a standard plate count
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Collectively, what did the work of Charles Darwin, Francis Darwin, and Fritz Went demonstrate about phototropism in plants? Select all correct choices
A. A chemical signal is produced in shoot tips in response to light. B. A chemical signal is produced in shoot stems in response to light. C. Cells exposed to a chemical signal produced by light will grow (elongate). D. Cells exposed to a chemical signal produced by light will not grow (elongate).
Adaptations for deep diving in cetaceans include all the following except:
a. large amount of hemoglobin. b. large amount of cholesterol. c. lowered sensitivity to lactic acid. d. high levels of myglobin. e. decreased metabolism.
You are using genetic engineering to design a protein that needs to be synthesized in the cytoplasm and then localized in the nucleus of the cell. To accomplish this, you could add
A) a DNA sequence for a nuclear localization signal into the DNA that will be present in the mature protein. B) the protein during mitosis, at a time when the nuclear membrane is dispersed. C) a nucleotide or few nucleotides to the DNA sequence for the protein. D) a series of specific polysaccharides to the carboxyterminal end of the protein. E) inverted repeats to the DNA sequence for the protein.
The diploid number for a human cell is 46; the chromatid number for a somatic cell at the beginning of G2 would therefore be _____.
A) 4 B) 23 C) 69 D) 92 E) different, depending on the cell type