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Cells
2A: Not all shall pass! Yards have fences, and cells have membranes. You don’t want just anybody waltzing into your backyard. Similarly, a healthy cell doesn’t just let in any random molecule – this is the concept of selective permeability. Some molecules (e.g. steroids) more easily cross the barrier whereas others (e.g. charged ions) have a more difficult time getting inside the cell without a little help from transporters in the membrane.
Reviews
What homeschoolers say about Khan Academy
Homeschoolers widely appreciate Khan Academy for its extensive free resources covering a broad range of subjects and grade levels, including test prep and advanced topics. Many praise its clear video lessons and interactive exercises that allow self-paced learning. However, some families find the platform less structured and requiring significant parental oversight to ensure consistent progress. Additionally, while the content quality is generally high, a few users note that the presentation can feel dry or overly academic for younger learners. Overall, Khan Academy is valued for accessibility and depth but may need supplementation for a fully rounded homeschool curriculum.
About Khan Academy’s materials generally, not this resource specifically. Summarized by Learnamic from public homeschool reviews and discussions.
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