Science Test #7 Flashcards
6 cards from real GED practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Science Test #7 flashcards as text
Which organelle is responsible for producing ATP through cellular respiration in eukaryotic cells?
Answer: Mitochondria
Mitochondria are called the powerhouse of the cell because they generate most of the cell's supply of ATP through the process of cellular respiration.
A car travels 150 miles in 3 hours and then 120 miles in 2 hours. What is the car's average speed for the entire trip?
Answer: 54 mph
Average speed = total distance ÷ total time = (150 + 120) ÷ (3 + 2) = 270 ÷ 5 = 54 mph.
Which of the following best describes the role of decomposers in an ecosystem?
Answer: They break down dead organic matter and recycle nutrients
Decomposers such as bacteria and fungi break down dead organisms and organic waste, returning nutrients like nitrogen and carbon back into the soil and atmosphere for reuse by producers.
Earth's layers from outermost to innermost are:
Answer: Crust, mantle, outer core, inner core
Earth is structured in concentric layers: the thin solid crust on the outside, followed by the thick mantle, then the liquid outer core, and finally the solid inner core at the center.
Which type of chemical bond involves the sharing of electron pairs between atoms?
Answer: Covalent bond
A covalent bond is formed when two atoms share one or more pairs of electrons. This type of bonding is common in molecules like water (H₂O) and carbon dioxide (CO₂).
According to the graph showing population growth, which growth pattern results in a J-shaped curve?
Answer: Exponential growth
Exponential growth produces a J-shaped curve because the population grows at a rate proportional to its current size — the larger the population, the faster it grows — with no limiting factors slowing it down.