What is a photosystem?
A. A double-membrane organelle containing thylakoids
B. Clusters of pigments and proteins that capture light energy
C. Stacks of thylakoids
D. A leaf or any green part of the plant
Answer: B
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True or false: The same strand in a DNA double helix is used as the template strand for transcription of every gene in a given chromosome
A. true B. false
Quality control is set up to test urea agar. M. genitalium and M. hominis are used; however, both organisms are negative for urease activity. Which one of the following statements explains these findings?
a. The urea agar is most likely expired. b. The incubation time is most likely abbre-viated. c. A technical error has occurred. d. These two organisms are poor choices for quality control of urea agar.
Where do terrestrial plants obtain the necessary carbon for photosynthesis?
What will be an ideal response?
When these enzymes bind to a restriction site, they cut the DNA molecule into two molecules.
A. polymerases B. ligases C. restriction enzymes D. helicases