Nursing Elites

1. What protein complex controls the progression of mitosis through its activation and degradation?

• A. Ribosome
• B. Cyclin-dependent kinase (CDK)
• C. Centriole
• D. Microtubule

Correct answer: B

Rationale: Rationale: A) Ribosome: Ribosomes are cellular organelles responsible for protein synthesis and are not directly involved in controlling the progression of mitosis. B) Cyclin-dependent kinase (CDK): CDKs are a family of protein kinases that regulate the cell cycle, including the progression of mitosis. CDK activity is controlled by cyclins, which bind to CDKs to activate them at specific points in the cell cycle. The activation and degradation of cyclins regulate the activity of CDKs, which in turn control the progression of mitosis. C) Centriole: Centrioles are involved in organizing the microtubules of the mitotic spindle but do not directly control the progression of mitosis. D) Microtubule: Microtubules are structural components of the cytoskeleton and are involved in various cellular processes, including mitosis, but they do not control

2. Repeating decimals can be expressed as fractions. Which of the following represents the decimal 0.7777... as a fraction?

• A. 77/1000
• B. 70/99
• C. 777/900
• D. 7/9

Correct answer: C

Rationale: Let x equal the decimal. Set up two equations such that the digits after the decimal point are identical. 1000x = 777.7777... 10x = 7.7777... Subtracting the two equations, we have 990x = 770. Dividing both sides by 990 gives us x = 770/990, which can be simplified to 77/90.

3. What is the purpose of the spindle apparatus in cell division?

• A. To separate sister chromatids
• B. To move chromosomes to opposite poles of the cell
• C. To form a new nuclear envelope around each daughter cell
• D. To synthesize new DNA

Correct answer: B

Rationale: Rationale: The spindle apparatus is a structure composed of microtubules that plays a crucial role in cell division (mitosis and meiosis). Its main purpose is to ensure the proper separation and distribution of chromosomes to opposite poles of the cell during cell division. This process is essential for the formation of two genetically identical daughter cells in mitosis or four haploid daughter cells in meiosis. Option A is incorrect because the separation of sister chromatids specifically refers to the role of the kinetochore fibers within the spindle apparatus. Option C is incorrect because the formation of a new nuclear envelope occurs after the chromosomes have been properly segregated. Option D is incorrect because DNA synthesis does not occur within the spindle apparatus; it takes place during the S phase of the cell cycle.

4. Which of the following is NOT a major component of a healthy blood pressure reading?

• A. Systolic pressure (peak pressure during ventricular contraction).
• B. Diastolic pressure (pressure within arteries during ventricular relaxation).
• C. Pulse pressure (difference between systolic and diastolic pressure).
• D. Blood oxygen saturation While blood oxygen levels are crucial for overall health, they are not directly reflected in a blood pressure reading.

Correct answer: A

Rationale: The correct answer is A. Systolic pressure is a major component of a healthy blood pressure reading as it represents the peak pressure in the arteries during ventricular contraction. Diastolic pressure, representing the pressure in the arteries during ventricular relaxation, is also a key component. Pulse pressure, the difference between systolic and diastolic pressure, provides additional information about the cardiovascular system. Blood oxygen saturation, while important for overall health, is not directly measured in a blood pressure reading. Therefore, it is not a major component of a healthy blood pressure reading.

5. What happens to the force of gravity between two objects when the distance between them is doubled?

• A. ) The force increases by a factor of 2
• B. The force increases by a factor of 4
• C. The force decreases by a factor of 2
• D. The force decreases by a factor of 4

Correct answer: d

Rationale: According to the inverse square law of gravity, the force of gravity decreases by a factor of 4 when the distance between two objects is doubled.

6. Which property of a substance describes its ability to conduct heat or electricity?

• A. Reactivity
• B. Conductivity
• C. Density
• D. Viscosity

Correct answer: b

Rationale: Conductivity refers to a substance's ability to conduct heat or electricity

Similar Questions