Hydrophobic substances such as vegetable oil are Select one: A. nonpolar substances that repel water molecules. B. nonpolar substances that have an attraction for water molecules. C. polar substances that repel water molecules. D. polar

Hydrophobic substances such as vegetable oil are

Select one:

A. nonpolar substances that repel water molecules.

B. nonpolar substances that have an attraction for water molecules.

C. polar substances that repel water molecules.

D. polar substances that have an affinity for water.

Which of the following descriptions would be an example of potential energy?

Select one:

A. the movement of a bicycle coasting down a hill

B. flood water rushing through a breach in a dam

C. a spark emitted by explosion of a firework

D. the chemical bonds in a molecule of sucrose

Which structure is common to plant and animal cells?

Select one:

A. mitochondrion

B. wall made of cellulose

C. chloroplast

D. centriole

During cellular respiration, electrons move through a series of electron acceptor molecules. Which of the following is a true statement about this process?

Select one:

A. The electrons gain energy as they move from one electron acceptor to another.

B. The electrons release large amounts of energy each time they are transferred from one electron acceptor to another.

C. Glucose is eventually reduced by the electrons to form water.

D. Oxygen is eventually reduced by the electrons to form water.

Which of the following statements correctly describes a function of the Golgi apparatus?

Select one:

A. protein modification and sorting

B. detoxification of drugs

C. synthesis of cytoplasmic proteins

D. production of ribosomal subunits

The biochemical reaction that joins two amino acids to form a dipeptide is accompanied by

Select one:

A. the release of a carbon dioxide molecule.

B. the addition of a nitrogen atom.

C. the release of a water molecule.

D. the addition of a water molecule.

What waste product do yeast produce under anaerobic conditions?

Select one:

A. creatine

B. lactic acid

C. ethyl alcohol

D. pyruvic acid

Expert Answer

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Question: Hydrophobic substances such as vegetable oil are

Answer: A: nonpolar substances that repel water molecules

Explanation: Hydrophobic means water hating which is self explanatory that hydrophobic molecules will repel water. Water is polar molecule hence hydrophobic substance cannot be polar because polar molecules mix or dissolve in polar substances whereas non polar substance repel polar substances.
When water is added to vegetable oil, the two liquids replled each other and did not mix together. Water molecules attracts each other forming a clump instead of mixing.
It indicates that the two liquids - water and oil are immiscible, that is they don't mix together.
Oils are hydrophobic in nature i.e. water fearing and hence they repel water.

Question:Which of the following descriptions would be an example of potential energy?

Answer: D. the chemical bonds in a molecule of sucrose

Explanation: Potential energy is stored form of energy and the chemical bonds in sucrose molecule store energy. They have energy stored in the electrons of their covalent bond. Hence it an example of potential energy.
Other options are incorrect because they depict kinetic energy as they are all in motion.

Question: Which structure is common to plant and animal cells?

Answer: A. mitochondrion

Explanation: mitochondria is common organelle found in both the plant and animal cell. Whereas, cell wall is absent in animal cells and present in plant cells. Plant perform photosynthesis and for that function it requore chloroplasts which is absent in animal cells.

Question: During cellular respiration, electrons move through a series of electron acceptor molecules. Which of the following is a true statement about this process?

Answer: B. The electrons release large amounts of energy each time they are transferred from one electron acceptor to another.

Explanation: As the electrons move from one electron acceptor to another they go from higher to lower energy level and eventually pass it to oxygen to form water and release large amount of energy.

Question: Which of the following statements correctly describes a function of the Golgi apparatus?

Answer: A. protein modification and sorting

Explanation:
The function of Golgi apparatus to modify and sort proteins for transportation throughout the cell. Proteins are transported in vesicles to the Golgi apparatus where they are sorted for transport to lysosomes. Golgi apparatus is important for transport sorting vesicles and lysosomes.
Option B is incorrect because Smooth endoplasmic reticulum(ER) is responsible for the detoxification of drugs.
Option C is incorrect because synthesis of cytoplasmic proteins takes place in the cytosol.
Option D is incorrect because nucleolus is responsible for production of ribosomal subunits.

Question: The biochemical reaction that joins two amino acids to form a dipeptide is accompanied by

Answer: C. the release of a water molecule

Explanation: An amino acid is an organic molecule that combine to form proteins and it is made up of a basic amino group (−NH2), an acidic carboxyl group (−COOH), and an organic R group (or side chain) specific to each amino acid. Amino acids undergo dehydration synthesis reaction to form a peptide bonds between the carboxyl group and amino group (C-N bonds) with a release of water molecule. In dehydration synthesis reactions, a water molecule is formed when a covalent bond is generated between two monomers in polymer.

Question: What waste product do yeast produce under anaerobic conditions?

Answer: C. ethyl alcohol