1. Skeletal muscles are attached to bones by tough connective tissues called

A. Ligaments
B. Tendons
C. Cartilage
D. Fascia

Correct answer: B

Rationale: The correct answer is B: Tendons. Skeletal muscles are connected to bones by tendons, which are tough connective tissues that transmit the force generated by the muscle to the bone, allowing movement. Ligaments (A) connect bone to bone and provide stability to joints. Cartilage (C) is a smooth, firm tissue that covers the surface of bones at joints, reducing friction and absorbing shock. Fascia (D) is a connective tissue that surrounds muscles and other structures, providing support and protection.

2. Which sentence uses comma splices incorrectly?

A. The baker kneaded the dough, flour dusted her apron, and the oven warmed up.
B. The mountains, shrouded in mist, seemed to disappear into the clouds.
C. He arrived late, having forgotten his keys, and the meeting had already started.
D. The movie, despite its flaws, was surprisingly enjoyable.

Correct answer: C

Rationale: Option (c) incorrectly combines two independent clauses with only a comma. A semicolon or conjunction is needed

3. Which energy conversion occurs in a solar cell?

A. Electrical energy to light energy
B. Chemical energy to electrical energy
C. Solar energy to thermal energy
D. Solar energy to electrical energy

Correct answer: d

Rationale: Solar cells convert solar energy (sunlight) directly into electrical energy.

4. How many amino acids can make up a protein?

A. 10-20
B. 50-100
C. 100-500
D. 1000+

Correct answer: A

Rationale: Rationale: Proteins are made up of long chains of amino acids. There are 20 standard amino acids that are commonly found in proteins. The sequence and arrangement of these amino acids determine the structure and function of a protein. While proteins can vary in size and complexity, the number of amino acids typically ranges from around 10 to 20 in smaller proteins to hundreds or even thousands in larger proteins. Therefore, the range of 10-20 amino acids is the most accurate representation of the number of amino acids that can make up a protein.

5. A block slides down a frictionless inclined plane. What determines its final velocity at the bottom?

A. The length of the incline
B. The angle of the incline
C. The mass of the block
D. All of the above

Correct answer: B

Rationale: In the absence of friction, the final velocity depends only on the gravitational potential energy gained, which is determined by the height difference related to the angle of the incline.

6. What property of matter remains constant regardless of changes in its state?

A. Mass
B. Volume
C. Density
D. Weight

Correct answer: a

Rationale: Mass remains constant for a given amount of matter, regardless of its state (solid, liquid, or gas) or its location in the universe. Explanation of other options: