What are the two ways in which a complete viral particle (protein surrounding nucleic acid) may be assembled, and what types of viruses use each of these two ways?
What will be an ideal response?
Ans: To assemble a complete virus, either the protein shell (capsid) is assembled around the nucleic acid, or the capsid is first assembled and then the nucleic acid is inserted into it. The capsids of filamentous RNA viruses are assembled around the RNA genome, while the capsids of spherical DNA viruses are assembled first and the duplex DNA inserted later.
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Which of the following geographical areas
offers the most suitable environment for development of life?
a. tropical regions b. temperate regions c. desert regions d. equatorial regions e. polar regions
He structure labeled __________ in Figure 35-1 is formed in the leaf scars by vascular tissue that extends from the stem out into the leaf
T
a. 5
b. 6
c. 7
d. 8
e. 9
In a DNA molecule, base pairing occurs between
A) adenine and uracil. B) thymine and cytosine. C) guanine and uracil. D) adenine and thymine. E) adenine and guanine.
Which of the following does not contain sugars?
A.) glycoproteins B.) steroids C.) glycolipids D.) cellulose E.) nucleotides