At approximately what age is the maximal level of bone mineralization reached?

A. 45-50
B. 30-40
C. 15-18
D. 20-30


B

Biology & Microbiology

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The metabolic diversity of photosynthetic bacteria stems from different

A) bacteriochlorophylls and pigments they contain. B) chlorophylls they can have and organic compounds they can produce. C) light-harvesting complexes, electron donors, and organic compounds they produce. D) unrelated taxa capable of photosynthesis.

Biology & Microbiology

When a photon collides with a pigment in a photosystem, an electron is boosted to a higher orbital and then ________

a. returns to its ground state, emitting the extra energy as heat b. returns to its ground state, emitting the extra energy as a photon of lower energy c. the electron enters an electron transfer chain in the stroma d. the electron enters an electron transfer chain in the thylakoid membrane

Biology & Microbiology

What accounts for carbon’s importance to life?

a. its ability to form rings b. its nonpolarity c. its versatile bonding behavior d. its ability to form rings e. its large size

Biology & Microbiology

Water draining from the land mixes with seawater

carried in on tides in which of the following? a. upper littoral b. midlittoral c. lower littoral d. estuary e. upwellings

Biology & Microbiology