Each photosystem in the chloroplast contains numerous pigment molecules, such as chlorophyll A, that act as antennae to capture light of different wavelengths.

Most scientists agree that about two billion years ago, photosynthetic cyanobacteria expanded rapidly and raised the concentration of oxygen in the earth’s atmosphere to present levels in about 500 million years.  This appearance of oxygen and the beginning of aerobic life was made possible by the appearance of

Based on the graph below showing chlorophyll absorption data during photosynthesis, what wavelength corresponds to the greatest photosynthetic activity? (What wavelengths would allow the greatest photosynthetic activity?) Absorption Spectrum.jpg

What is required at each step of a metabolic pathway?  Choose all that apply.

What electron carriers are used to transfer energy during aerobic cellular respiration?

Females have 1,000,000 mature egg cells during their reproductive years.

Zygotes only contain genetic material from the female.

Testosterone is the feminizing hormone.

The bulbourethral glands add alkaline secretions to the seminal fluid.

Describe ovulation.