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37 multiple-choice questions and 28 flashcards on Structure and Function of Cells, about 25% of the 7th Grade Science bank. Every one carries a written rationale.
Structure and Function of Cells is one of 5 chapters in CoStudy's 7th Grade Science (Life Science) bank, and it holds 37 of the bank's 150 multiple-choice questions — roughly 25% of the total. That proportion is not arbitrary: chapters follow the certifying body's published exam outline, and the number of questions in each is set by that domain's published weight, so the share of your practice time this chapter takes matches the share of the real exam it accounts for.
Studying by chapter is worth doing once you have a diagnostic score. A single overall percentage tells you whether you are close; it does not tell you which domain is dragging. Working a weak chapter in isolation, and re-testing it in isolation, is the fastest way to move a score that has stalled — and it is why the mock exams in CoStudy report by domain rather than as one number.
10 questions drawn from this chapter, with the full rationale shown — the controlling principle behind the right answer, and why each wrong option tempts and fails.
Longitudinal waves (like sound) have particle motion that is:
Answer: B — Parallel to wave direction — compressions and rarefactions
B) Particles oscillate along the direction of travel. A) transverse; C/D) wrong.
Which organelle is found in plant cells but NOT animal cells?
Answer: C — Chloroplasts
Chloroplasts carry out photosynthesis — unique to plant/algae cells. (A) both have mitochondria; (B) both have cell membranes; (D) both have ribosomes.
Two waves are sent through the same rope. Wave 1 has higher amplitude than Wave 2. Wave 1 therefore:
Answer: C — Carries more energy than Wave 2
C) Amplitude ∝ energy. A/B/D) independent of amplitude.
Which statement is part of the CELL THEORY?
Answer: C — All living organisms are composed of one or more cells
Cell theory (1839): (1) all living things are made of cells; (2) cells are the basic unit of life; (3) all cells come from existing cells. (A) prokaryotes lack a nucleus; (B/D) all living things have cells.
Heat transfer by RADIATION:
Answer: B — Is electromagnetic-wave transfer that can travel through a vacuum (e.g., sunlight reaching Earth)
B) EM radiation needs no medium. A) opposite of radiation; C/D) wrong.
A primary difference between prokaryotic and eukaryotic cells is that:
Answer: D — Eukaryotic cells contain a nucleus and membrane-bound organelles, while prokaryotic cells do not
D) Defining feature is nuclear and organelle structure. A) Eukaryotes are typically larger. B/C) Both contain DNA; some eukaryotes (plants) use sunlight.
The amplitude of a wave is BEST described as:
Answer: C — The maximum displacement of the wave from rest position — relates to energy/loudness/brightness
C) Amplitude = height from equilibrium. A) wavelength; B) frequency; D) speed.
Average speed is calculated as:
Answer: D — distance ÷ time
D) v = d/t. A/B/C) wrong operations.
Cellular respiration breaks down glucose using oxygen. Its outputs are:
Answer: B — Carbon dioxide, water, and ATP (energy)
B) C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP. A) reverses to photosynthesis; C/D) irrelevant.
The basic unit of life is the:
Answer: A — Cell
A) Cell theory. B/C) Chemistry units, not biological. D) Multi-cellular structure.
4 cards from the 28 in this chapter.
What do chloroplasts do (plant cells only)?
Carry out photosynthesis — convert sunlight into chemical energy (sugar).
What's a key difference between plant and animal cells?
Plants have cell wall, chloroplasts, and one large vacuole. Animals don't.
What is 'cellular respiration'?
Cells break down glucose to release energy (ATP). Opposite of photosynthesis.
What is the 'nucleus' of a cell?
Control center holding DNA — the genetic instructions.
These are a sample. The full Structure and Function of Cells chapter runs 65 items with per-chapter progress tracking, on the web and in the iOS app.
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