Active Transport
Akopọ
Diffusion and osmosis are free, but they only ever move substances down a gradient. So how does a root hair cell pull mineral ions out of soil that is far more dilute than the cell itself? How do gut cells grab the last of the glucose when there is little left to absorb? The answer is active transport: moving substances uphill, against the gradient, by spending energy.
In this lesson you will learn exactly what active transport is, why cells need it, and, at Extended level, how protein carriers in the membrane and energy from respiration make it possible.
Awọn Afojusun
- [Supplement] Describe active transport as the movement of particles through a cell membrane from a region of lower concentration to a region of higher concentration (i.e. against a concentration gradient), using energy from respiration
- [Supplement] Explain the importance of active transport as a process for movement of molecules or ions across membranes, including ion uptake by root hairs
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Active Transport. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- Active transport moves particles: A. down the concentration gradient B. against the concentration gradient C. only when water moves D. without any energy Answer: B
- The energy for active transport comes from: A. sunlight B. diffusion C. respiration D. osmosis Answer: C
- Which cells use active transport to absorb mineral ions from dilute soil water? A. red blood cells B. root hair cells C. nerve cells D. palisade cells Answer: B
- Which would stop active transport? A. adding glucose B. a respiratory poison C. raising the concentration gradient D. adding oxygen Answer: B
- Active transport across a membrane is carried out by: A. chlorophyll B. ribosomes C. carrier proteins D. cellulose Answer: C
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Active Transport? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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