Enzyme activity may be affected by
a. salinity.
b. pH.
c. inhibitors.
d. the presence of cofactors.
e. all of these.
Answer: e
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The developmental pathway of each whorl of a developing Arabidopsis flower is determined by (Select all correct choices):
A. the number of meristem cells in each whorl. B. the specific combination of genes active in each whorl. C. the specific combination of activities in each whorl. D. the specific combination of transcription factors present in each whorl. E. the specific combination of cell types in each whorl.
Which of the following pairs indicates the closest
macroevolutionary link among the animals according to the evolutionary history tree in the text? a. flatworms; roundworms b. sponges; cnidarians c. arthropods; annelids d. arthropods; roundworms e. echinoderms; mollusks
How does a bacterial cell protect its own DNA from restriction enzymes?
A. by adding methyl groups to adenines and cytosines B. by reinforcing bacterial DNA structure with covalent phosphodiester bonds C. adding histones to protect the double-stranded DNA D. by forming "sticky ends" of bacterial DNA to prevent the enzyme from attaching E. using DNA ligase to seal the bacterial DNA into a closed circle
In order to gain the highest resolution when looking at a cell the best type of microscopy is
A. fluorescence microscopy. B. scanning electron microscopy. C. differential-interference light microscopy. D. phase-contrast light microscopy. E. confocal microscopy.