13. A red pigment is extracted from a marine alga. Which best supports the hypothesis that thepigment is involved in photosynthesis? The red pigment:A. has an absorption spectrum similar to that of chlorophyll.B. is also found in land plants together with a variety of other pigments and specific enzymes thatare related to the action spectrum for photosynthesis.C. has a molecular structure similar to that of chlorophyll.D. contains iron which is a transition element similar to magnesium.E. has an absorption spectrum similar to the photosynthetic action spectrum for that same marinealga.

The best answer to support the hypothesis that the red pigment is involved in photosynthesis would be E. "has an absorption spectrum similar to the photosynthetic action spectrum for that same marine alga."

Here's why:

A. While having an absorption spectrum similar to that of chlorophyll might suggest that the red pigment is involved in photosynthesis, it doesn't necessarily prove it. Other pigments could also have similar absorption spectra.

B. The fact that the red pigment is found in land plants along with other pigments and enzymes related to photosynthesis suggests a correlation, but not necessarily a causation. It doesn't directly support the hypothesis that the red pigment itself is involved in photosynthesis.

C. A similar molecular structure to chlorophyll might suggest a similar function, but it doesn't necessarily mean that the red pigment is involved in photosynthesis. Other molecules could have similar structures but different functions.

D. The presence of iron, a transition element similar to magnesium, doesn't necessarily mean that the red pigment is involved in photosynthesis. Many molecules contain transition elements but are not involved in photosynthesis.

E. If the red pigment has an absorption spectrum similar to the photosynthetic action spectrum for the same marine alga, it strongly suggests that the pigment is involved in photosynthesis. The photosynthetic action spectrum represents the wavelengths of light that are most effectively used in photosynthesis, so if the red pigment absorbs light at these wavelengths, it's likely playing a role in the process.