Which four elements make up 96% of the weight of living organisms?
A.) carbon, oxygen, sodium, and hydrogen
B.) carbon, hydrogen, nitrogen, and oxygen
C.) carbon, phosphorus, sodium, and hydrogen
D.) carbon, calcium, oxygen, and nitrogen
E.) carbon, sodium, chlorine, and oxygen
Ans: B.) carbon, hydrogen, nitrogen, and oxygen
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Why has cystic fibrosis persisted at such a high
percentage in some populations?
a. affected individuals reproduce before the disease is fatal b. there is an advantage to being a carrier c. recessives have a higher fitness than dominants d. it is an easily treated disease e. the symptoms disappear in early adulthood
During intense physical exercise, human cells and tissues increase their need for oxygen to provide the ATP necessary for work. Why does heart rate have to increase to meet the need for oxygen?
What will be an ideal response?
Tuberculosis remains a serious worldwide health problem due to all of the following except
A. ease of transmission. B. absence of MDR strains. C. the prevalence of HIV infections. D. social factors such as crowding and incarceration. E. multi-drug resistance.
The Mannitol Salt Agar is used mainly to
A. isolate and differentiate between the different streptococcus bacteria B. isolate and differentiate between the different enterococcus bacteria C. isolate and differentiate between the different staphylococcus bacteria D. isolate and differentiate between the different enterobacteriacae bacteria E. none of the above