Cell Structure
Akopọ
Everything a living thing does, it does with cells. A cheek cell, an oak leaf cell and a cell buried in the root of a daffodil are all built from the same short list of parts, arranged differently and used for different jobs. Learn that list properly and a great deal of the rest of biology stops being memory work and starts being reasoning.
In this lesson you will name the parts of animal and plant cells and say what each one does. You will see why a plant cell carries three extras that an animal cell does not, and why one of those three is missing from some plant cells and not others. Then you will practise the skill the examiners really want: looking at an unfamiliar cell, spotting what it has an unusual amount of, and working out what that cell must be for.
Awọn Afojusun
- Most animal cells (eukaryotic cells) have the following parts: a nucleus, which controls the activities of the cell ; cytoplasm, in which most of the chemical reactions take place; a cell membrane, which controls the passage of substances into and out of the cell; mitochondria, which is where most energy is released in respiration.
- In addition to the above, plant cells (eukaryotic cells) often have: chloroplasts, which absorb light energy to make food; a permanent vacuole filled with cell sap. Plant and algal cells also have a cell wall made of cellulose, which strengthens the cell.
- Cells may be specialised to carry out a particular function. Students should be able, when provided with appropriate information, to relate the structure of different types of cell to their function in a tissue, an organ, or the whole organism.
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Oriire fun ipari ẹkọ lori Cell Structure. 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.
- Which part of a cell controls the passage of substances into and out of it? A. The nucleus B. The cell wall C. The cell membrane D. The cytoplasm Answer: C
- Which structure is found in a plant cell but NOT in an animal cell? A. A permanent vacuole B. A nucleus C. A mitochondrion D. A cell membrane Answer: A
- What is the cell wall of a plant cell made of? A. Cell sap B. Cytoplasm C. Cellulose D. Starch Answer: C
- A cell taken from the root of a plant contains no chloroplasts. What is the best explanation? A. Root cells are not plant cells B. No light reaches the root C. Roots do not take in water D. Chloroplasts are found only in animal cells Answer: B
- A cell contains a very large number of mitochondria. What does this suggest? A. It stores a lot of water B. It releases a lot of energy by respiration C. It photosynthesises rapidly D. It has a very thick cell wall Answer: B
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