Which correctly matches the structure in the leaf to the material it carries to the leaf for photosynthesis? A. veins carry water, chloroplasts take in carbon dioxide, stomata take in solar energy
B. veins carry water, stomata take in carbon dioxide, chloroplasts take in solar energy
C. veins carry sugar, stomata take in oxygen, chloroplasts take in solar energy
D. veins carry water, stomata take in oxygen, chloroplasts take in sugar

The trp operon in e. coli regulates genes that code for enzymes required for synthesis of the repressible operon. when tryptophan is not available amino acid tryptophan. the trp operon is a in the environment, the trp repressor protein activeinactiveregulated. therefore, rna polymerase can bind to the genes to begin transcription.

Asolution of an enzyme and a substrate was placed in a water bath and the temperature of the reaction was raised gradually. the graph shown was plotted at the end of the experiment. what can be concluded from the graph? a) temperature has no effect on the activity of the enzyme. b) the effect of temperature on the enzyme is unpredictable. c) the enzyme shows increased activity up to a certain temperature. d) the activity of the enzyme is inversely proportional to the temperature.

Asegment of dna that codes for rna and a protein is a