Which of the following types of molecules are most important for a cell to protect from damage if the
cell is to stay alive and reproduce?
a. proteins
b. lipids
c. nucleic acids
d. carbohydrates
e. amino acids
C
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Which of the following samples of microbial communities would be best suited for study by microelectrode experiments?
A. During infection in a human patient B. Sample sorted by optical tweezers C. Striated microbial mats D. 10 gallons of seawater
All species in the phylum Arthropoda share which of the following features?
a. segmented bodies b. book lungs c. three sets of legs d. a fused thorax
Give an example of both fibrous and globular proteins and explain how their structure relates to their unique functions
What will be an ideal response?
Which statement best describes the role of the E. coli RNA polymerase sigma factor?
a. Sigma factor allows assembly of RNA polymerase. b. Sigma factor is responsible for catalyzing the formation of phosphodiester bonds during RNA polymerization. c. Sigma factor shuttles cytoplasmic RNA polymerase to promoter sequences. d. Sigma factor increases the affinity of RNA polymerase for promoter sequences. e. Sigma factor actively removes core enzyme from DNA and attaches it to a promoter.