Which of the following events occurs initially when Escherichia coli cells are in a gradient of a chemorepellent?
A. CheY is phosphorylated
B. Cells tumble
C. CheA autophosphorylates
D. Flagella rotate clockwise
Answer: C
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Describe two capabilities of microbes that exemplify their dynamic nature
What will be an ideal response?
_______________ are chemical substances produced in small quantities in one part of an organism and then transported to another part of the organism, where they bring about physiological responses.
A. Glycoproteins B. Photosynthates C. Hormones D. Heat shock proteins E. Pulvini
RNA is a multifaceted molecule and key component to the success of life. Which of the following statements about RNA is most accurate?
a. RNA is incapable of storing information, but it is vital in converting the information embedded in DNA to useful proteins. b. The world was most likely filled with DNA-life first, which evolved to produce RNA-life. c. There is no link between RNA and the possibility of it being a precursor to cellular life. d. It is possible that this complex molecule could have been a self-replicating system. e. RNA is an enzyme.
You are viewing an image from a microscope in which the specimens in the smear have more than one color. You are probably looking at
A. a smear stained with a differential stain. B. a specimen stained with various fluorescent molecules. C. a scanning tunneling micrograph. D. a specimen on a dark-field microscope. E. either a specimen stained with a differential stain or fluorescent molecules.