A Large Proportion of Archaeans Are "Extremophiles," So Called Because

question 67

Multiple Choice

A large proportion of archaeans are "extremophiles," so called because they inhabit extreme environments with high acidity and/or high temperature. Such environments are thought to have been much more common on the primitive Earth. Thus, modern extremophiles survive only in places that their ancestors became adapted to long ago. Which of these is, consequently, a valid statement about modern extremophiles, assuming that their habitats have remained relatively unchanged?

• A)Among themselves, they should share relatively few ancestral traits, especially those that enabled ancestral forms to adapt to extreme conditions.
• B)On a phylogenetic tree whose branch lengths are proportional to amount of genetic change, the branches of the extremophiles should be shorter, relative to branches of the non-extremophilic archaeans.
• C)They should contain genes that originated in eukaryotes that are the hosts for numerous species of bacteria.
• D)They should currently be undergoing a high level of horizontal gene transfer with non-extremophilic archaeans.

Describe the characteristics and implications of different types of exhaust smoke.

Differentiate between the types of tests used for engine diagnosis and their specific applications.

Understand the importance of proper oil pressure and how to test for it.

Diagnose issues related to the air/fuel mixture and exhaust systems.

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Definitions:

Alternatives

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Marketing strategies that aim to advertise a product to people without them realizing they are being marketed to.

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Guidelines and procedures established by a corporation to protect its assets, employees, and information from threats and to ensure the safety and integrity of its business operations.