Biology chapter 4 the chemicals of life
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12 questions
| 🇬🇧 | 🇬🇧 |
| Fat is produced from fatty acids and glycerol by cells in the fatty tissue beneath the skin. State one function of this layer of fat | Thermal insulation ; |
| Amino acids are an example of a type of nutrient transported in the blood. State two examples of larger molecules found in cells that are made from amino acids. | Protein ; named proteins ;; |
| Fat is a necessary component of the human diet. State three ways in which the human body uses fat | 1 (for) energy / energy source / respiration ; 2 storage / stored ; (fat or vitamins or energy) 3 insulation / reduce heat loss / maintains temperature / ref to myelin ; 4 protection (against mechanical damage) / cushions organs / shock absorber ; 5 AVP ; 6 AVP ;e.g. buoyancy making (some) hormones making (cell) membranes provide heat absorption of vitamins waterproofing |
| Describe the structure of a DNA molecule. | Double helix; (strands) contain, bases /A and T and C and G; A joins with T/C joins with G; strands /bases, join/ pair up, by crosslinks /hydrogen bonds; AVP; |
| Explain these results. | Iodine solution diffused, into the bag/through the (Visking) tubing ; iodine molecules small (enough to pass through the membrane) ; iodine solution stains starch ora ; no starch diffused, out of the bag/ through the (Visking) tubing ; starch molecules too large (to pass through the membrane) ; ref to pore /AW, size ; |
| State three factors that influence the movement of molecules through membranes | Temperature ; (surface) area ; concentration (gradient)/water potential ; size/ type, of molecule ; thickness /distance, across membrane/ permeability (of membrane) ; pressure ; (number of) protein, channels / pumps /AW ; energy / number of mitochondria ; |
| Describe and explain the results shown in Table 3.1. | Blue at time 0 indicates no glucose present ; ensures that no glucose on outer surface of dialysis tubing / in water, as a result of an error ; green / yellow / red, indicates presence of glucose ; glucose, diffuses / moves, out of dialysis tubing / into water ; (movement is) down the concentration gradient / high to low concentration ; dialysis tubing is permeable to glucose ; AVP ; |
| The student repeated the investigation with a higher concentration of glucose in the dialysis tubing. Predict the results that the student would observe. | Idea that (Benedict’s solution) changes colour quicker / gives more intense colour / AW ; |