{"id":26460,"date":"2025-06-19T14:58:38","date_gmt":"2025-06-19T14:58:38","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=26460"},"modified":"2025-06-19T14:58:41","modified_gmt":"2025-06-19T14:58:41","slug":"concentration-gradient","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/concentration-gradient\/","title":{"rendered":"concentration gradient"},"content":{"rendered":"\n<p>concentration gradient? None of these is correct Active transport Simple diffusion Phagocytosis Facilitated diffusion 1 pts<br>Question 42 What type of movement is passive and down a concentration gradient? None of these is correct Active transport Simple diffusion Phagocytosis Facilitated diffusion 1 pts<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p><strong>Correct Answer:<\/strong><br><strong>Simple diffusion<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Explanation <\/strong><\/p>\n\n\n\n<p>Movement across a cell membrane can happen in different ways depending on whether the process uses energy and the direction of the concentration gradient. A <em>concentration gradient<\/em> exists when there is a difference in the concentration of a substance across a space, such as across a membrane. Movement <em>down<\/em> a concentration gradient means particles are moving from an area of higher concentration to an area of lower concentration.<\/p>\n\n\n\n<p>The correct answer to the question asking for a type of movement that is <em>passive<\/em> and moves <em>down<\/em> the concentration gradient is <strong>simple diffusion<\/strong>.<\/p>\n\n\n\n<p>Simple diffusion is the movement of molecules without the use of energy or assistance from proteins. It happens naturally as molecules spread out evenly in a space. This process is passive because it does not require the cell to expend any energy, such as ATP. It is driven purely by the kinetic energy of the molecules themselves.<\/p>\n\n\n\n<p>Examples of simple diffusion include oxygen and carbon dioxide passing through the cell membrane. These molecules are small and non-polar, so they can easily move through the lipid bilayer of the cell membrane.<\/p>\n\n\n\n<p>Other options listed in the question are incorrect in this context:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Active transport<\/strong> requires energy and moves substances <em>against<\/em> their concentration gradient.<\/li>\n\n\n\n<li><strong>Phagocytosis<\/strong> is a form of endocytosis in which the cell engulfs large particles, which also requires energy.<\/li>\n\n\n\n<li><strong>Facilitated diffusion<\/strong> is passive but involves protein channels or carriers to help move molecules across the membrane. While it is also down the gradient, it is not \u201csimple\u201d diffusion because it requires a protein.<\/li>\n\n\n\n<li><strong>None of these is correct<\/strong> is not valid since one option (simple diffusion) fits perfectly.<\/li>\n<\/ul>\n\n\n\n<p>Therefore, simple diffusion is the best answer for a passive process that moves substances down their concentration gradient.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"852\" height=\"1024\" src=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-102.jpeg\" alt=\"\" class=\"wp-image-26461\" srcset=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-102.jpeg 852w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-102-250x300.jpeg 250w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-102-768x923.jpeg 768w\" sizes=\"auto, (max-width: 852px) 100vw, 852px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>concentration gradient? None of these is correct Active transport Simple diffusion Phagocytosis Facilitated diffusion 1 ptsQuestion 42 What type of movement is passive and down a concentration gradient? None of these is correct Active transport Simple diffusion Phagocytosis Facilitated diffusion 1 pts The Correct Answer and Explanation is: Correct Answer:Simple diffusion Explanation Movement across a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-26460","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/26460","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/comments?post=26460"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/26460\/revisions"}],"predecessor-version":[{"id":26462,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/26460\/revisions\/26462"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=26460"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=26460"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=26460"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}