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What is a cytoskeleton? What are its main constituents in animal cells?
Cytoskeleton is the cytoplasmic structure that handles the cell, keeps its shape and fixates and moves the cell organelles. It is made of an extensive network of fibers dispersed in the cytoplasm and anchored in the plasma membrane. Its mechanisms are microtubules, microfilaments and intermediate filaments.
Cell Skeleton and Cell Movement - Image Diversity: the "cell skeleton"
DIGESTION Digestive enzymes break down food particles into smaller units. You will see that the final breakdown products of protein digestion are single amino acids or small c
Describe the process of excitation-contraction coupling (ECC) in the heart. How do adrenaline, noradrenaline and acetylcholine alter heart rate and or force?
Does the hypophysis-ovaries endocrine axis work in the same way during pregnancy as in non-pregnant women? If pregnancy does not occur how does another menstrual cycle begin? T
Give three examples of artificial selection. Include examples of both animals and plants. Answers will vary, but could include domestic cats, domestic dogs, cattle, sheep, an
Transfer RNA (tRNA) molecules play an very significant role in protein synthesis. Each tRNA becomes covalently bonded to a particular amino acid to create aminoacyl- t
In biology, Homeostasis is the ability of an open program to manage its internal environment to sustain constant circumstances through several energetic stability improvements mana
various changes that occur during concentration of food
Vitamin A (Retinol) Purified vitamin A is a viscous yellowish oil. It is freely soluble in most organic solvents such as methanol, ether, acetone, chloroform and petroleum ethe
There is no splitting of the centromere. The kinetochore fibers contract and the spindle or pole fibers elongate , As a result homologous chromosomes of each pair rather than
Hypoglycaemia is defined as state of low blood glucose level of less than 50mg/dl. Low blood sugar level varies from person to person. Causes Since hypoglycaemia can occur in
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