Baker's yeast is a single-celled ascomycete that is used in bread making. Why does yeast make bread dough rise?
A. Yeast cells take in carbon dioxide, causing them to swell and the dough to expand.
B. Exponential growth of the yeast cells physically expands the dough.
C. The fungal cells burst and release spores, causing the dough to expand.
D. Yeast cells produce carbon dioxide during fermentation, causing the dough to expand.
Answer: D
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Crossing over
a. generally results in binary fission. b. involves nucleoli. c. involves breakages and exchanges being made between sister chromatids. d. alters the composition of chromosomes and results in new combinations of alleles being channeled into the daughter cells. e. is the same as disjunction.
In_______, cells are tagged with a fluorescent dye and injected into a flowing, progressively narrowing stream of fluid, forcing one cell at a time through a laser beam that scatters its fluorescence to a detector.
What will be an ideal response?
In eukaryotes, ____ regulation is the first level at which gene expression is controlled
a. transcriptional b. translational c. posttranscriptional d. posttranslational e. replicative
All of the following would be examples of entry via the parenteral route EXCEPT:
a. an injection b. a hair follicle?skin c. a bite wound d. surgery e. a skin cut