100+ Free Alaska Science Grade 10 Practice Questions

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Key Facts: Alaska Science Grade 10 Exam

Alaska Science Grade 10 is the statewide spring science summative (40 items worth 40 points across three parts, ~40 min each) covering Life Science and Physical Science at 50% each, scored Needs Support to Advanced.

Sample Alaska Science Grade 10 Practice Questions

Try these sample questions to test your Alaska Science Grade 10 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A student compares two cell types under a microscope. Cell A has a nucleus, mitochondria, and a cell wall with chloroplasts. Cell B has a nucleus and mitochondria but no cell wall or chloroplasts. Which conclusion is BEST supported by these observations?

A.Cell A is a plant cell and Cell B is an animal cell

B.Cell A is a prokaryote and Cell B is a eukaryote

C.Both cells are bacteria that live in different habitats

D.Cell B is a plant cell and Cell A is an animal cell

Explanation: Chloroplasts and a cell wall are characteristic of plant cells, while animal cells lack both. Both cells have nuclei, so both are eukaryotic.

2Which organelle is primarily responsible for producing ATP through cellular respiration in eukaryotic cells?

A.Ribosome

B.Mitochondrion

C.Golgi apparatus

D.Lysosome

Explanation: Mitochondria carry out aerobic cellular respiration, oxidizing glucose-derived molecules to produce most of the cell's ATP.

3A table shows relative surface-area-to-volume ratios for cube-shaped model cells of different side lengths. | Side length (cm) | Surface area (cm²) | Volume (cm³) | SA:V | | 1 | 6 | 1 | 6.0 | | 2 | 24 | 8 | 3.0 | | 3 | 54 | 27 | 2.0 | Based on the data, why do cells tend to remain small?

A.As size increases, SA:V increases, so large cells exchange materials too quickly

B.Volume decreases faster than surface area, so large cells cannot store nutrients

C.As size increases, SA:V decreases, limiting efficient exchange of materials

D.Surface area stays constant while volume increases, so large cells never grow

Explanation: The table shows SA:V falling as side length increases. Cells depend on surface membrane for nutrient and waste exchange; a lower ratio makes diffusion-based exchange less efficient, favoring smaller cells.

4During the cell cycle, DNA is replicated in which phase?

A.G1 phase of interphase

B.Prophase of mitosis

C.Cytokinesis

D.S phase of interphase

Explanation: DNA replication occurs during S (synthesis) phase of interphase so each daughter cell can receive a complete genome.

A.Insulin signaling increases the number of glucose transporters in the membrane

B.Insulin breaks down glucose outside the cell, lowering the measured uptake

C.Insulin converts the cell into a prokaryote that absorbs sugar faster

D.Insulin blocks the production of membrane transport proteins

Explanation: Insulin triggers signaling that moves GLUT transporters to the plasma membrane in target cells, increasing glucose uptake. The fourfold rise is consistent with more transporters mediating facilitated diffusion.

6Which statement correctly compares passive and active transport across a cell membrane?

A.Both require ATP, but only active transport uses protein channels

B.Passive transport moves substances down their concentration gradient without ATP; active transport can move substances against a gradient using energy

C.Passive transport only moves water; active transport only moves ions

D.Active transport never uses membrane proteins, while passive transport always does

Explanation: Diffusion and facilitated diffusion are passive (no cellular energy; net movement high to low). Active transport uses energy to move substances against their gradient.

7Enzymes speed up chemical reactions in cells primarily by

A.increasing the temperature inside the cell to boiling

B.changing the products of the reaction into different substances

C.lowering the activation energy of the reaction

D.providing all of the energy needed to build ATP

Explanation: Enzymes are biological catalysts that lower activation energy, allowing reactions to proceed faster at cellular temperatures without being consumed.

8A graph of an enzyme-catalyzed reaction shows product formation rising quickly at first and then leveling off even though substrate remains. The MOST likely reason the rate levels off is that

A.the enzyme has been permanently destroyed by the substrate

B.product formation always stops after exactly one minute in every reaction

C.enzymes reverse direction and convert all product back to substrate instantly

D.all enzyme active sites are occupied, so the reaction is at maximum velocity

Explanation: When substrate is saturating, every enzyme molecule is busy (approaching Vmax). With limited enzyme and remaining substrate, product accumulation levels as the system approaches equilibrium under enzyme limitation.

9Which structure allows prokaryotic cells to carry genetic information even though they lack a nucleus?

A.A circular chromosome in the nucleoid region

B.A membrane-bound nucleus with multiple linear chromosomes

C.Chloroplasts that store DNA only during division

D.Mitochondria that replace the need for cellular DNA

Explanation: Prokaryotes typically have a single circular chromosome located in the nucleoid, not enclosed by a nuclear membrane.

10A student models osmosis using dialysis tubing filled with 10% starch solution placed in distilled water. After 30 minutes the tubing is firm and swollen. Which explanation is BEST?

A.Starch molecules diffused out rapidly, creating a vacuum that pulled water in

B.Water moved into the tubing by osmosis because the inside had a lower water concentration

C.Distilled water actively pumped itself into the tubing using ATP from starch

D.Water molecules were converted into starch inside the tubing

Explanation: Starch solution has more solute and lower free water concentration than distilled water. Water diffuses into the bag. Starch is too large to exit quickly, so volume and turgidity increase.

About the Alaska Science Grade 10 Exam

The Alaska Science Assessment Grade 10 is the state's required spring science summative for grade 10, aligned to the K–12 Science Standards for Alaska (2019). Reporting categories are Life Science and Physical Science. The test emphasizes three-dimensional learning: science and engineering practices, disciplinary core ideas, and crosscutting concepts. OpenExamPrep provides free English multiple-choice study questions on concepts, evidence, and data reasoning; it does not replace investigations, modeling, or the official multi-part assessment.

Questions

40 scored questions

Time Limit

Three parts at about 40 minutes each (~120 minutes total estimated); the assessment is untimed.

Passing Score

Reported in four achievement levels: Needs Support, Approaching Proficient, Proficient, and Advanced (Alaska DEED AK STAR / Science score reports).

Exam Fee

Free for eligible Alaska public school students; AK STAR and the Alaska Science Assessment are state-required summative assessments administered by districts at no cost to families. (Alaska DEED; delivered via DRC INSIGHT)

Alaska Science Grade 10 Exam Content Outline

~50%

Life Science

From molecules to organisms, ecosystems, heredity, and biological evolution themes.

~50%

Physical Science

Matter and its interactions, motion and stability, energy, and waves.

How to Pass the Alaska Science Grade 10 Exam

What You Need to Know

Passing score: Reported in four achievement levels: Needs Support, Approaching Proficient, Proficient, and Advanced (Alaska DEED AK STAR / Science score reports).
Exam length: 40 questions
Time limit: Three parts at about 40 minutes each (~120 minutes total estimated); the assessment is untimed.
Exam fee: Free for eligible Alaska public school students; AK STAR and the Alaska Science Assessment are state-required summative assessments administered by districts at no cost to families.

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

Alaska Science Grade 10 Study Tips from Top Performers

1Practice claims-evidence-reasoning with short phenomena and data tables.

2Connect vocabulary (force, energy, ecosystem, scale) to models and examples, not definitions alone.

3Review grade-band core ideas in life, physical, and (for grades 5/8) Earth/space science.

4Use DEED Online Tools Training to learn the official platform item types.

5When reading graphs, check axes, units, and what question is actually asked before choosing.

Frequently Asked Questions

Who takes Alaska Science Grade 10?

Alaska students in grade 10 take the statewide Alaska Science Assessment in the spring window.

What content is assessed?

Reporting categories are Life Science and Physical Science, based on the K–12 Science Standards for Alaska.

How is the test structured?

Three parts, computer-based (DRC INSIGHT), with 40 items worth 40 points total; basic and scientific calculators and an on-screen periodic table are available at grade 10.

How long does it take?

About 40 minutes per part, roughly 120 minutes total estimated, though the assessment is untimed.

How are scores reported?

Four achievement levels: Needs Support, Approaching Proficient, Proficient, and Advanced, with reporting-category performance.

Is there a fee?

No family fee for eligible Alaska public school students.

100+ Free Alaska Science Grade 10 Practice Questions

Alaska Science Assessment Grade 10

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