Question

question 17
which of the following is found in viruses and not in cells?

cytosol
protein capsid
ribosomes
nucleolus

question 18
assume that two strands of dna have been separated and that the base sequence on one strand is ttgc. what is the sequence of bases on the complimentary strand?

gtac
gcta
aacg
cgtt

Explanation:

Question 17

• Cytosol is the fluid portion of the cytoplasm in cells, so it is not unique to viruses.
• Ribosomes are present in cells (e.g., in prokaryotic and eukaryotic cells) for protein synthesis, not exclusive to viruses.
• Nucleolus is a structure within the nucleus of eukaryotic cells, not found in viruses.
• Protein capsid is a structure that encloses the genetic material of a virus. Cells do not have a protein capsid as part of their basic structure.

In DNA, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). Given the sequence TTGC on one strand:

• The first 'T' will pair with 'A'.
• The second 'T' will pair with 'A'.
• The 'G' will pair with 'C'.
• The 'C' will pair with 'G'.

Answer:

b. protein capsid

Question 18