1. Microfilaments and microtubules are both components of the cytoskeleton, but they have different functions. Which of these describes microfilaments?

A. Provide structural support and shape
B. Facilitate cell movement and contraction
C. Form the mitotic spindle during cell division
D. Transport materials within the cell

Correct answer: B

Rationale: Microfilaments are composed of actin filaments and are responsible for facilitating cell movement and contraction. They play a crucial role in processes such as muscle contraction, cell division, and cell shape changes. Microfilaments are involved in generating forces for cell motility and maintaining cell shape, making option B, 'Facilitate cell movement and contraction,' the correct choice. The other options are not accurate for microfilaments: A) Structural support and shape are primarily provided by intermediate filaments, C) Mitotic spindle formation is attributed to microtubules, and D) Transport of materials within the cell is usually carried out by microtubules and motor proteins.

2. Which of the following is the basic unit of the nervous system?

A. Neuron
B. Nerve
C. Ganglion
D. Neuroglia

Correct answer: A

Rationale: Rationale: Neurons are the basic structural and functional units of the nervous system. They are specialized cells that transmit information through electrical and chemical signals. Nerves are bundles of neurons, ganglia are clusters of nerve cell bodies outside the central nervous system, and neuroglia are support cells for neurons. However, neurons are specifically responsible for transmitting and processing information in the nervous system, making them the basic unit of this system.

3. What is the unit of measurement for power?

A. Joule (J)
B. Newton (N)
C. Watt (W)
D. Kilogram-meter (kgÂ·m)

Correct answer: c

Rationale: Power is measured in watts (W) in the SI unit system.

4. In plant cells, what structure provides rigidity and support?

A. Cell membrane
B. Golgi apparatus
C. Plastid
D. Cell wall

Correct answer: D

Rationale: The correct answer is D: Cell wall. The cell wall is a rigid structure found in plant cells that provides support and protection. It is composed of cellulose and other materials, forming a tough outer layer that helps maintain the cell's shape and prevents it from bursting under pressure. The cell membrane (option A) is a semi-permeable barrier that surrounds the cell but does not provide rigidity. The Golgi apparatus (option B) is involved in sorting and packaging proteins. Plastids (option C) are organelles responsible for functions like photosynthesis and storage, but they do not provide rigidity and support like the cell wall does.

5. Which sentence uses the correlative conjunction "either/or" correctly?

A. You can either come to the party or stay home.
B. Either she will go to the concert, or he will.
C. I'm not sure whether I should go swimming or running.
D. He likes both pizza and pasta, so he can have either.

Correct answer: A

Rationale: Option Aa uses "either/or" to present two exclusive options.

6. What is the absolute value of -7?

A. 49
B. 17
C. 7
D. 14

Correct answer: A

Rationale: Absolute value refers to the non-negative distance of a number from zero. Regardless of being positive or negative, 7 is its distance from zero.