FREE AND STUDY GAMES ABOUT CELL AND MOLE E:1

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FREE AND STUDY GAMES ABOUT CELL AND MOLE E:1

EXAM QUESTIONS

Qs and Ans Expert- Explanation

This Exam contains:

-Guarantee passing score -69 Questions and Answers -format set of multiple-choice -Expert- Explanation Question 1: In a folded protein, nonpolar (hydrophobic) amino acid side chains tend to be:

Answer:

folded away from the water interface and hidden inside the protein Question 2: In water, hydrogen bonds form between:

Answer:

Oxygen and hydrogen atoms Question 3: Enzymes that add or remove a phosphate group are respectively named?

Answer:

Kinase and phosphatase

Question 4: What determines the number of covalent bonds an atom can create?

Answer:

The excess or shortage of electrons in its outermost electron shell.

Question 5: Proteins that lack a sorting signal peptide are retained in the?

Answer:

Cytosol Question 6: Protein structure is dictated by the amino acid sequence. Should a protein, in which the order of all amino acids is reversed have the same structure as the original protein?

Answer:

No the amino acid sequence is the same but the amino and carboy termini are not Question 7: Oxygen with 6 electrons in the outer electron shell (that needs 8 to be complete), can make how many covalent bonds?

Answer:

2

Question 8: The reverse of a condensation reaction is called?

Answer:

hydrolysis Question 9: Why is it that thousands of weak bonds (hydrogen bonds) make such stable and specific structural arrangements? Identify a statement that is NOT TRUE.

Answer:

Hydrogen bonds are weak individually and do not contribute to an overall equilibrium Question 10: if a signal sequence is removed by genetic engineering from an ER protein:

Answer:

the protein is retained in the cytosol Question 11: Phospholipids make a fluid liquid, meaning that molecules move within the membrane structure without the input of energy. Which of the following phospholipid movements require the input of energy?

Answer:

phospholipid flipping (movement from one layer to another).

Question 12: Which of the following generates the largest amount of ATP?

Answer:

oxidative phosphorylation.

Question 13: Which of the following are true energy carriers in cells?

Answer:

ATP/GTP and NADH and NADPH and FADH2.

Question 14: What happens to the membrane of a vesicle after exocytosis?

Answer:

It fuses with and becomes part of the plasma membrane.

Question 15: Phospholipids form lipid bilayers spontaneously because?

Answer:

They are amphipathic (polar and non-polar) Question 16: Even though peroxisomes, chloroplasts and mitochondria import proteins via a translocon complex they do it differently. Which of the following is NOT TRUE about protein import into specialized organelles?

Answer:

peroxisome importer proteins (POC/PIC) denature cargo proteins while importing proteins across a double layer membrane structure

Question 17: Which group is NOT present on ALL amino acids?

Answer:

Hydroxyl group Question 18: Photosynthesis enables plants to capture energy from sunlight to produce:

Answer:

sugars Question 19: Even though peroxisomes, chloroplasts and mitochondria import proteins via a translocon complex they do it differently. Which of the following is TRUE about protein import into specialized organelles?

Answer:

mitochondria if a protein has 1 or more transmembrane domains it is not released in the mitochondrial matrix space but rather diverted to the mitochondrial inner membrane

chloroplast targeted proteins sometimes have 2 signal peptides 1 to deposit the p Question 20: Which characteristic of a phospholipid contributes to the fluidity of the membrane?

Answer:

double bonds in the fatty acid tail Question 21: Protein kinases phosphorylate target enzymes and as a result enzymes become activated or inactivated. Which of the following statement is NOT TRUE?

Answer:

the presence of a phosphate group tags the enzyme allowing interactions with other enzymes.

Question 22: Which of the statements are TRUE about oxidative phosphorylation?

Answer:

Electrons start at very low redox potentials that increases at each transfer step.

Electrons start out at very high free energy and lose energy at each transfer step.Question 23: Sugars (glucose) ingested from food are broken down by:

Answer:

glycolysis, the citric acid cycle, and oxidative phosphorylation.

Question 24: What type of bond is formed when atoms share electrons?

Answer:

covalent bond Question 25: Translation of proteins that initiate in the cytosol but are destined for other

organelles must first associate with the:

Answer:

endoplasmic reticulum Question 26: Which organelle accepts proteins and lipids from the endoplasmic reticulum, modifies them, and redistributes them to other destinations of the cell?

Answer:

golgi apparatus