Nursing Elites

1. Which of the following properties is NOT characteristic of a covalent bond?

• A. Sharing of electrons between atoms
• B. High melting and boiling points
• C. Low electrical conductivity in solid state
• D. Directional bonding

Correct answer: B

Rationale: Covalent bonds are formed by the sharing of electrons between atoms, leading to the formation of molecules with directional bonding. This means that the atoms are held together in a specific orientation. Covalent compounds generally exhibit low melting and boiling points compared to ionic compounds due to the weaker intermolecular forces present in covalent compounds. Furthermore, covalent compounds do not conduct electricity in the solid state because the electrons are localized between the atoms and are not free to move and carry charge. Hence, high melting and boiling points are not characteristic of covalent bonds. The correct answer is 'B' because high melting and boiling points are typically associated with ionic compounds due to their strong electrostatic interactions, while covalent compounds have lower melting and boiling points. Choices A, C, and D are all characteristics of covalent bonds, making them incorrect answers for this question.

2. What enzymes do lysosomes contain, leading to their nickname as the cell's 'suicide bags'?

• A. Hydrolytic enzymes
• B. Ligases (bonding enzymes)
• C. Transferases (molecule transfer)
• D. Oxidoreductases (redox reactions)

Correct answer: A

Rationale: Lysosomes are organelles filled with hydrolytic enzymes that break down proteins, nucleic acids, lipids, and carbohydrates. These enzymes aid in digesting cellular waste and foreign substances, hence the term 'suicide bags' due to their involvement in cell degradation and recycling. Ligases are enzymes that catalyze the joining of two large molecules by forming a new chemical bond, not present in lysosomes. Transferases are enzymes that catalyze the transfer of functional groups from one molecule to another, not found in lysosomes. Oxidoreductases are enzymes involved in oxidation-reduction reactions, which are not the primary function of lysosomes.

3. Which term is most closely aligned with the definition of the term working man as it is defined in the following passage?

• A. Plebeian
• B. Viscount
• C. Entrepreneur
• D. Bourgeois

Correct answer: A

Rationale: The correct answer is 'Plebeian' as it represents the common people, which aligns closely with the definition of a 'working man.' 'Viscount' refers to a nobleman ranking above a baron but below an earl. 'Entrepreneur' is a person who organizes and operates a business, typically taking financial risks in the hope of profit. 'Bourgeois' relates to the middle class, typically with reference to its perceived materialistic values or conventional attitudes.

4. Because of all your running around, their clients are confused about who's in charge, and the company is losing its competitive edge. Which contraction should be used to correct the error?

• A. Who's
• B. Whos
• C. Who’ll
• D. Who

Correct answer: A

Rationale: The correct contraction to use in this sentence is 'who's,' which is short for 'who is.' In the given context, 'who's' indicates the correct possessive form, clarifying that the clients are confused about who is in charge. Choice B, 'Whos,' is incorrect as it does not use an apostrophe to indicate the omitted letter. Choice C, 'Who’ll,' is incorrect as it is a contraction for 'who will,' which does not fit the context of the sentence. Choice D, 'Who,' is incorrect as it is not a contraction and does not clarify the intended meaning of the sentence.

5. Where does the maturation of T-cells and the production of T-cell receptors occur?

• A. Thymus
• B. Spleen
• C. Lymph nodes
• D. Bone marrow

Correct answer: A

Rationale: The correct answer is the Thymus. T-cells mature and develop their receptors in the thymus gland, making it a vital organ for the immune system. The thymus provides the necessary environment for T-cells to differentiate and acquire their specific receptors and functions, which are essential for their role in the adaptive immune response. The spleen, lymph nodes, and bone marrow are all important components of the immune system, but they do not primarily serve as sites for T-cell maturation and T-cell receptor production.

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