Substances given off by yeasts during fermentation are
a) alcohol
b) carbon dioxide
c) organic acids
d) all of these
Ans: d) all of these
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Which of the following groups of biomes is listed in order of greatest to lowest evapotranspiration ratio?
A. rain forest, deciduous forest, desert B. desert, deciduous forest, rain forest C. deciduous forest, desert, rain forest D. desert, rain forest, deciduous forest E. deciduous forest, rain forest, desert
Microevolution is the term given to evolutionary changes that produce new species and groups of species
Indicate whether the statement is true or false
Pheromones ____
a. are signaling molecules that are used for olfactory communication between two different species b. are only used by invertebrates c. require a vomeronasal organ to be detected d. are signaling molecules used for olfactory communication between members of the same species e. are signaling molecules geese use for navigation
Which of the following statements about microtubules is true?
(a) Motor proteins move in a directional fashion along microtubules by using the inherent structural polarity of a protofilament. (b) The centromere nucleates the microtubules of the mitotic spindle. (c) Because microtubules are subject to dynamic instability, they are used only for transient structures in a cell. (d) ATP hydrolysis by a tubulin heterodimer is important for controlling the growth of a microtubule.