What is the world's largest fossil fuel reserve?
a. Oil
b. Methane hydrate
c. Natural gas
d. Coal
b
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Enzymes that readily break starch apart cannot hydrolyze the glycosidic linkages found in cellulose. Why is this logical?
A) The geometry of the bonds is different, and the shapes of enzyme active sites are highly specific. B) Starch is held together by hydrogen bonding, not covalent bonding. C) Cellulose molecules are highly branched, and enzymes are too bulky to fit. D) Starch is held together by peptide bonds, not glycosidic linkages.
Which of the following processes is the flow of heat between atoms or molecules in direct contact?
a. conduction b. radiation c. evaporation d. convection e. radiative cooling
An example of an excavate that has a pellicle is Euglena
__________________ Indicate whether the statement is true or false.
Darker skin is more prevalent among indigenous people living in areas with high amounts of UV radiation. Nina Jablonski proposed a hypothesis to explain the selective pressure for darker skin in these environments. On which of the following observations did she base this hypothesis?
A) The melanin in darkly pigmented skin protects cells from UV radiation, which can cause skin cancer B) The larger amount of melanin in darkly pigmented skin protects circulating folate from being destroyed by UV radiation C) In general, people with darker skin have lower amounts of folate D) Human populations have different versions of the MC1R gene