BIOS 251 ACTUAL FINAL EXAM 2025
WITH 150 QUESTIONS AND WELL-
VERIFIED CORRECT ANSWERS |
ALREADY GRADED A+ | GUARANTEED
A+ | BIOS 251 LATEST EXAM 2025 [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