where in plants does

1.photosynthesis occur?
2.gas exchange (O2 CO2)


1 in leaves, in mesophyl
2.stomata

Biology & Microbiology

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What is the purpose of the cartilage rings in the trachea?

A) to prevent food from passing into the trachea B) to assist with contracting the trachea C) to produce mucus to trap debris D) to keep the trachea open

Biology & Microbiology

Suppose a geneticist sequences a specific gene region in two species, A and B, previously known to be closely related. He specifically wants to see which of the two species is closer to an ancestral species

The sequence comparison showed that this region in species B has an extra intron, unlike other near relatives, but that otherwise A and B are virtually the same for this region. Based on this data alone, he could reason that which species was more likely ancestral?

Biology & Microbiology

The respiratory center is very sensitive to changes in ________ levels, but not very sensitive to changes in ________ levels

A) blood sugar; hormone B) carbon dioxide; oxygen C) oxygen; carbon dioxide D) hormone; blood sugar E) temperature; blood pressure

Biology & Microbiology

More than ________ antibiotics are produced by Streptomyces

a. 50 b. 500 c. 2500 d. 10,000

Biology & Microbiology