Evolutionary biology is the study of:
a. the modifications in organisms over time.
b. descent with modification.
c. the origin, maintenance, and diversity of life on Earth.
d. All of the above.
C
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Consider the links in the chain of infection. Which of the links is broken when hands are thoroughly washed?
A. Virulence B. Exposure C. Dose D. The agent E. Susceptibility
Communities with a high level of bacterial diversity are found in many habitats including soil and aquatic environments. Recent studies indicate this diversity is crucial to the functioning of these communities. The same studies have also found that phage abundance plays a critical role in the maintenance of the bacterial diversity within these communities. What is the probable role of phages in this community? (Check all that apply)
_____ they act as facilitators _____ they have a mutualistic relationship with the bacteria _____ they parasitize the bacteria _____ they have a commensal relationship with the bacteria _____ they compete with the bacteria for space and nutrients _____ they keep any one species of bacteria from becoming too abundant in the community 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 maintaining bacterial diversity in a community? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection 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?
Under normal healthy circumstances, the lymphatic system filters any microorganisms present.
Answer the following statement true (T) or false (F)
Which of the following types of reproductive barriers separates two species of sea cucumbers whose sperm and eggs often bump into each other but do not cross-fertilize because of incompatible proteins on their surfaces?
A) temporal isolation B) habitat isolation C) mechanical isolation D) gametic isolation