Keystone Subject Areas 1 — Questions and Answers
Question 1: Which of the following represents the solution to the equation 2𝑥+5=15?
- x=3
- x=5 (Correct answer)
- x=7
- x=10
Correct answer: x=5
To solve the equation 2x + 5 = 15, first subtract 5 from both sides, which gives 2x = 10. Then, divide both sides by 2. This isolates x, resulting in x = 5.
Question 2: Which process is directly responsible for genetic variation in sexually reproducing organisms?
- Mitosis
- Fertilization
- Meiosis (Correct answer)
- Protein synthesis
Correct answer: Meiosis
Meiosis is a specialized type of cell division that reduces the chromosome number by half, creating four haploid cells, each genetically distinct from the parent cell. This process involves two rounds of division and includes crossing over, where homologous chromosomes exchange genetic material. This exchange, along with independent assortment, generates significant genetic variation in sexually reproducing organisms.
Question 3: In a literary work, which term describes the central idea or message conveyed by the author?
- Plot
- Theme (Correct answer)
- Setting
- Characterization
Correct answer: Theme
The theme of a literary work is its central idea, underlying message, or insight into life that the author conveys. It's often a universal truth or a significant observation about human nature or society. Unlike plot, which is the sequence of events, the theme is the deeper meaning or moral lesson explored throughout the narrative.
Question 4: What is the slope of the line represented by the equation 𝑦=3𝑥−2?
- 3 (Correct answer)
- -2
- 1
- 0
Correct answer: 3
The equation y = 3x - 2 is in the slope-intercept form, which is y = mx + b. In this form, 'm' represents the slope of the line and 'b' represents the y-intercept. Therefore, by comparing the given equation to the slope-intercept form, we can directly identify that the slope (m) is 3.
Question 5: What organelle is known as the "powerhouse of the cell"?
- Nucleus
- Ribosome
- Mitochondria (Correct answer)
- Chloroplast
Correct answer: Mitochondria
Mitochondria are often referred to as the "powerhouse of the cell" because they are responsible for generating most of the cell's supply of adenosine triphosphate (ATP), which is used as a source of chemical energy. This process, known as cellular respiration, converts nutrients into ATP, fueling various cellular activities.
Keystone Subject Areas 1
Which of the following represents the solution to the equation 2𝑥+5=15?