Describe what constitutes a lichen. How do they obtain their nutrition? Where are they usually found in the rocky intertidal?
What will be an ideal response?
Lichens are symbiotic associations between algae and fungi. The algae supply the association with food from photosynthesis, while the fungus supplies nutrients from its decomposition and waste products. Lichens are common in the supralittoral fringe of rocky shores.
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Photoheterotrophs are best described as organisms that obtain energy to make ATP
A) from organic compounds but use sunlight to produce carbon sources. B) and organic compounds from sunlight. C) from sunlight but cannot make organic compounds from CO2. D) from some forms of chemicals. E) from organic compounds.
Bacterial flagella are composed of three parts: the ________ body, which is embedded in the cell, the hook, and the ________, which is the longest part of the flagellum.
Fill in the blank(s) with the appropriate word(s).
How can a mutation in a tumor-suppressor gene behave as a recessive allele at the cellular level, but appear as a dominant allele in pedigree analysis?
A) Some functional protein can still be produced in a cell heterozygous for a loss-of-function allele; however, an additional mutation can inactivate the second allele, eliminating all functional protein allowing cancer to occur in many family members. B) A single functional allele is sufficient to regulate the cell cycle, but not sufficient to promote apoptosis, allowing cancer to develop in every generation. C) A cell with half the amount of the functional tumor-suppressor protein can form benign tumors that will occur in every generation in the pedigree. D) Some functional protein can still be produced in a cell heterozygous for a loss-of-function allele; but loss-of-function tumor-suppressor alleles are so common in the population that many individuals are homozygous.
The scanning electron microscope cannot take precise measurements of elemental concentrations in glass fragments because of the ______ of the glass fragments.
What will be an ideal response?