BIOS 251 ACTUAL FINAL EXAM

BIOS 251 ACTUAL FINAL EXAM

WITH 150 QUESTIONS AND WELL-

VERIFIED CORRECT ANSWERS |

ALREADY GRADED A+ | GUARANTEED

A+ | BIOS 251 LATEST EXAM [ NEW]

What would happen if you mix some egg whites in a copper bowl instead of a crystal or plastic one?

• The copper ions will add a reddish tone to the mix
• The copper ions will stabilize already denatured proteins from egg whites
• The copper ions won't affect the egg whites at all
• The copper ions will avoid protein denaturation - ANSWER- B) The copper

ions will stabilize already denatured proteins from egg whites

How can we obtain cells for a cell culture?

• We culture stable cell lines
• We use stem cells
• All of these options are possible
• We take them from the animal or plant, making a primary culture - ANSWER-
• All of these options are possible

How do we produce new cells?A)Magnify existing cells 1 / 4

• Duplicate existing cells
• Destroy existing cells
• Measure existing cells - ANSWER- B) Duplicate existing cells

Cell division is essential for any living organism. For which of these processes is it NOT essential?

• Tissue renewal
• Growth and development
• Reproduction
• Preservation - ANSWER- D) Preservation

What does each duplicated chromosome have two of?

• RNA molecules
• Identical chromatids
• copies of the entire DNA
• Different chromatids, one from the father and the other from the mother -

ANSWER- B) Identical chromatids

Most of your cells contain 46 chromosomes. You inherited 23 from your mother and 23 from your father.Before the cells divide, each of them condenses into an x-shaped duplicated chromosome, which can be seen with a light microscope. At this stage, what does each of these chromosomes NOT contain?

• Exactly two chromatids
• Exactly two DNA helices
• Exactly four histones
• chromatin - ANSWER- C) Exactly four histones 2 / 4

DNA wound around histones forms a structure that looks like beaded string. What is this structure called?

• Chromosome
• Histone
• Chromatin
• DNA - ANSWER- C) Chromatin

Where is the secondary structure known as alpha helix located within a tertiary structure?It is depicted in blue it is depicted in yellow - ANSWER- It is depicted in yellow

How do acids denature proteins ? - ANSWER- They modify the pH and disturb the salt bridges

What levels of protein structure are affected when adding strong bases to them?

• All protein structure levels
• Secondary, tertiary, and quaternary levels
• Only tertiary and quaternary levels
• Only quaternary level - ANSWER- Secondary, tertiary, and quaternary levels

What kind of protein interactions are disturbed by the addition of an alcohol?

• the salt bridges
• The hydrogen bonds
• The peptide bonds 3 / 4

• The covalent bonds - ANSWER- The hydrogen bonds

Why do slats need to be at a high concentration level to affect the protein structure?

• because otherwise the kinetic energy cant be increased
• because it is the only way to disrupt the primary structure
• to have enough ions to interact with the salt bridges in the proteins
• they don't need to be highly concentrated to affect the protein structure -

ANSWER- C) to have enough ions to interact with the salt bridges in the proteins

What kind of protein interactions are disrupted by the addition of metal?

• The hydrogen bonds
• The disulfide bonds
• The peptide bonds
• The hydrophobic bonds - ANSWER- B) The disulfide bonds

How can a highly concentrated salt denature a protein?

• Due to the interactions of cations and anions with the salt bridges.
• Due to the increase in the pH
• Salts can never denature a protein
• Due to the mechanical forces involved - ANSWER- A) Due to the interactions

of cations and anions with the salt bridges.

What is protein coagulation?

• The loss of native protein structure
• The formation of new interactions among denatured proteins
• / 4