Energy flows into the biosphere from ____
a. water
b. raw materials
c. decomposition
d. ecosystems
e. the sun
ANSWER: e
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Imagine that you have isolated a yeast mutant that contains a constitutively (constantly) active histone deacetylase. What phenotype do you predict for this mutant?
A) The mutant will grow rapidly. B) The mutant will require galactose for growth. C) The mutant will show low levels of gene expression. D) The mutant will show high levels of gene expression.
Trophic levels form the basis of food chains and food webs. Thoroughly discuss and give examples of the four trophic
levels plus decomposers. Use a specific ecosystem (such as the desert, forest, etc.) to show the relationships between the various levels. Make sure you use real plants and animals as examples. What will be an ideal response?
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
The cellular process that changes DNA into a mRNA molecule is called _________
Fill in the blank(s) with the appropriate word(s).