Which of the following types of light microscopy improves the resolution of thick specimens by illuminating one plane of the specimen at a time?
A) fluorescence microscopy
B) phase-contrast microscopy
C) confocal microscopy
D) differential interference contrast microscopy
E) brightfield microscopy
Answer: C
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Two lakes have the same number of species. Most of the fish in Lake 1 are of a single species, with a few individuals each for the remaining species. Lake 2, on the other hand, has about equal numbers of each species
Which lake has higher species diversity? A) Lake 1 B) Lake 2 C) They are equally diverse. D) The number and relative abundance of species are not related to diversity.
The genes for the enzymes of glycolysis
A) are present in all metabolizing cells, but the genes for specialized proteins are expressed only in particular cell types. B) are present in all metabolizing cells, and the genes for specialized proteins are expressed in all cell types. C) and the genes for all specialized proteins are expressed in all metabolizing cells. D) and the genes for all specialized proteins are expressed in all embryonic cells.
Canaliculi are narrow canals that allow osteocytes trapped in lacunae to remain in contact with each other.
a. true b. false
Skin color is coded for by several different genes which results in a range of skin colors from very dark to very light. This is an example of ________________.
a. a multifactorial trait b. polygenic inheritance c. pleiotropy d. codominance