Some friends are trying to make wine in their basement. They've added yeast to a sweet grape juice mixture and have allowed the yeast to grow
After several days, they find that sugar levels in the grape juice have dropped, but there's no alcohol in the mixture. The most likely explanation is that ________. A) the mixture needs more sugar; yeast need a lot of energy before they can begin to produce alcohol
B) the mixture needs less oxygen; yeast only produce alcohol in the absence of oxygen
C) the mixture needs more oxygen; yeast need oxygen to break down sugar to produce alcohol
D) the mixture needs less sugar; high sugar concentrations stimulate cellular respiration, and alcohol is not a by-product of cellular respiration
B
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Which ancestors of modern humans migrated out of Africa to populate the rest of the world?
a. Homo habilis b. Homo erectus c. Neanderthals d. Cro-Magnon e. Homo sapiens
In what way(s) is the science of biology influencing and changing our culture?
A) by helping us understand the relevance of evolution to human health B) by revealing how mutations in genes can lead to disease C) by providing new tools for forensic investigations D) all of the above
You are a nutritional scientist and discover an organic molecule that is water-soluble and is essential to good health but does not appear to be manufactured by the human body. It is most likely a
A. mineral. B. carbohydrate. C. vitamin. D. polypeptide.
In a lichen, the fungal partner ________.
A. provides a substratum within which the alga grows B. protects the alga from excess light intensities C. provides water and minerals to the alga D. All of the choices are correct.