Which of the following descriptions best represents the gradual model of speciation?
A) Speciation occurs regularly as a result of the accumulation of many small changes.
B) An isolated population differentiates quickly from its parent stock as it adapts to its local environment.
C) Speciation occurs under unusual circumstances and therefore transitional fossils are hard to find.
D) Species undergo little change over long periods interrupted only by short periods of rapid change.
Answer: A
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Microtubules and microfilaments are said to be "dynamic" elements of the cytoskeleton. In this case, dynamic means that:
A. once individual microfilaments and microtubules have formed they can change shape and move around inside the cell. B. they are constantly changing and are never in the same place for very long. C. microtubules and microfilaments are assembled and disassembled and then reassembled again in a regulated manner.
The phenotype in homozygous dominant individuals affected with an autosomal genetic disorder is often more severe than the ____________________ phenotype
Fill in the blank(s) with correct word
The fungus Penicillium produces a compound that blocks peptidoglycan assembly. Why is a fungus trying to kill bacteria?
A. Fungi eat bacteria. B. Fungi and bacteria are both decomposers and compete for resources. C. The compound produced by the fungus is used for nitrogen fixation, the antibacterial properties are accidental. D. The fungal compound is produced in response to a bacterial invasion of the fungal hyphae. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about fungi? How does it relate to the question? · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
An organism has been found to contain a defective form of photolyase. What function might be impaired in this organism?
A. repair of DNA damage caused by UV light B. recognition of damaged DNA by the UvrABC complex C. stabilization of single-stranded DNA during DNA replication D. lengthening of the tips of chromosomes