When bar-headed geese fly at very high altitudes (possibly over Mount Everest!), they breathe very thin air where the partial pressure of oxygen is very low compared to that at sea level. They are able to do this because they have a modified version of

the hemoglobin protein. To which of the following is their hemoglobin protein most likely similar in terms of its ability to bind oxygen?

A) an adult human
B) a human fetus
C) a bird that lives at sea level
D) an earthworm


Answer: B

Biology & Microbiology

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At a certain point in the flowering process, shoots become committed to making a flower. This is called 

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Approximately, how many gene products are

involved in the synthesis of melanin?

a. 10 b. 25 c. 50 d. 100 e. 1000

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What feature do the carbon and nitrogen cycles have in common?

A. often a limiting nutrient B. involvement in global climate change C. mostly local cycling D. many microbes involved in cycling E. a large atmospheric component

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In eukaryotic cells, which of the following contains DNA?

A. Nucleus, mitochondria, Golgi apparatus B. Nucleus, endoplasmic reticulum, Golgi apparatus C. Nucleus, nucleolus, Golgi apparatus D. Nucleus, chloroplast, mitochondria E. Nucleus, chloroplast, peroxisome

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