When a virus has a broad host range
A. it does not require close contact to infect a new host.
B. it can infect many different cell types.
C. it can infect many different species.
D. the species that the virus can infect are spread over a large geographic distance, potentially causing pandemics.
E. it can infect many cell types or species.
E. it can infect many cell types or species.
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HDL cholesterol is considered "good" cholesterol. What role does HDL play in preventing coronary heart disease?
a. HDL cholesterol inhibits LDL cholesterol synthesis b. HDL cholesterol prevents transport of LDL cholesterol in blood c. HDL cholesterol activates LDL cholesterol breakdown d. HDL cholesterol prevents free radical formation in plaques e. HDL cholesterol removes excess cholesterol from plaques
In both stems and leaves, photosynthetic tissues lie beneath the __________
a. cortex b. periderm c. pith d. epidermis e. sclerenchyma.
Which one of the following experiments would be considered acceptable in our society?
A) Determining the effects of cocaine use on babies born to cocaine-using mothers. B) Determining the response of a patient's "incurable" cancer to a newly developed cancer drug. C) Testing the effects of radiation exposure on volunteers. D) Testing the effectiveness of a new AIDS vaccine using deliberate exposure of human volunteers to HIV. E) Testing the effectiveness of a newly developed antibiotic using deliberate exposure of humans to antibiotic-resistant bacteria.
An animal with a diploid number of 36 chromosomes will have ____ chromosomes in its gametes and ____
chromosomes in its somatic cells. a. 18; 18 b. 18; 36 c. 36; 18 d. 36; 36 e. 36; 72