Biology 104: Exam 1 Practice Test questions and answers

Biology 104: Exam 1 Practice Test questions and answers 1. In a water molecule (H2O), the oxygen atom: -Correct Answer-B) carries a partial negative charge 2. Which domains of life include prokaryotic cells? -Correct Answer-B) Bacteria and Archaea 4. What is a hydrogen bond? -Correct Answer-B) An attraction between partial positive and negative charges 5. Thepromoterofagenedetermines: -Correct Answer-B) where transcription will begin 7. Of the structures listed below, what is the smallest structure that has all the properties of life? -Correct Answer-C) Cell 9. The overall three-dimensional shape of a single polypeptide chain is called its: -Correct Answer-D) tertiary structure 10. What parts of a nucleotide can form a phosphodiester bond with one another? -Correct Answer-C) The 5' phosphate group and the 3' hydroxyl group 11. When a pre-mRNA molecule is spliced to produce a mature mRNA molecule, the sequences that are spliced together and retained in the mature mRNA are called: -Correct Answer-D) exons 12.An atom is most stable (and least chemically reactive) when: -Correct Answer-D) its valence shell is full 13. The coding (nontemplate) strand of a portion of a gene has the sequence 5'-AAGCGTGTTGC-3'. What is the sequence of the mRNA molecule that will be produced based on the information in this DNA molecule? -Correct Answer-C) 5'-AAGCGUGUUGC-3' 14. Which of the following statements about the phospholipid bilayer is INCORRECT? -Correct Answer-D) The addition of saturated fatty acids to a phospholipid bilayer will increase its fluidity. 15. When a gene sequence from a bacterial cell is placed into a eukaryotic cell, the eukaryotic cell can synthesize the correct protein encoded by gene. However, if a eukaryotic gene is placed into a bacterial cell, the bacterial cell cannot use the information to synthesize the correct protein. Why is a bacterial cell unable to synthesize a protein correctly from a eukaryotic gene? -Correct Answer-C) Bacterial cells cannot splice mRNA molecules. 16. When a eukaryotic mRNA is synthesized, how is the 5' end of the molecule modified? -Correct Answer-C) A 7-methylguanosine cap is attached to the 5' end of mRNA. 17. What is chromatin composed of? -Correct Answer-C) DNA and protein 19. Compared to a solution that has a pH of 6.0, a solution with a pH of 3.0 contains: -Correct Answer-C) 1000 times more protons