Which statement is true regarding bacteria?
A. Some bacteria are pathogens and harmful to humans, whereas lots of bacteria are helpful to humans.
B. All bacteria are pathogens, but some harm humans more than others.
C. All bacteria are helpful to humans.
D. All bacteria are pathogens and harmful to humans.
Answer: A
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Which curves on the graphs may represent the temperature and pH profiles of an enzyme taken from a bacterium that lives in a mildly alkaline hot springs at temperatures of 70 °C or higher?
A) curves 1 and 5 B) curves 2 and 4 C) curves 2 and 5 D) curves 3 and 4 E) curves 3 and 5
As a scientist working for an anti-bioterrorism task force, you are asked to evaluate some biological samples for the presence of Yersinia pestis, the organism that causes the plague. After confirming that the samples do contain Y. pestis, you instruct your team to begin sequencing the strain. Since the genome sequence of Y. pestis is already known, why would sequencing this strain be useful?
A. To provide better data for the genome database B. To establish the course of infection, and determine whether the strain is altered by causing infection C. To help determine the source of the strain, and learn whether it has been genetically engineered D. To create a vaccine for this particular strain Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about genome analysis? Consider Possibilities · Consider the different answer options. Which can you rule out? 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?
No human cells lose all of their DNA during differentiation
Indicate whether the statement is true or false
For most of its approximately million year history, the human population has been in the ____ phase of population growth.
A. lag B. exponential growth C. deceleration D. stable equilibrium