Some viruses never use DNA to carry out protein synthesis and have only RNA as their genetic material. This would lend evidence to which theory?
A. endosymbiotic theory of eukaryote evolution
B. protein-first hypothesis
C. simultaneous evolution of RNA and proteins
D. RNA-first hypothesis
Answer: D
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As a visitor to a country in which cholera is an endemic disease, what specific steps would you take to reduce your risk of cholera exposure? Will these precautions also prevent you from contracting other waterborne diseases? If so, which ones?
Identify waterborne diseases for which your precautions may not prevent infection. What will be an ideal response?
Two-thirds of the plasma proteins are glucoprotein
1.True 2.False
Bacteria need iron for growth. However, iron is not found in free form in the blood. So the bacteria may use which of the following mechanism(s) to obtain iron from the host?
A. Secrete enzymes that denature transferrin, a protein that is bound to iron B. Ingest iron-rich proteins known as ferrosomes C. Secrete chelating proteins known as siderophores D. Extract iron from the hosts' own transferrin molecules E. Both, secrete chelating proteins known as siderophores and extract iron from the hosts' own transferrin molecules
If an atom has 22 electrons, it is
a. reactive b. not reactive