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Dodaj cały arkusz do zestawuA research team is considering replacing sensory cells lost through an inherited disorder. Which property makes a suitable stem-cell population useful for this approach? A. It can differentiate into the damaged cell type B. It must already contain a complete…
Equal cylinders cut from a storage root are placed separately in sucrose solutions of 0.00, 0.20, 0.40, 0.60 and 0.80 mol dm⁻³. The solution isotonic with the tissue is 0.35 mol dm⁻³. Assuming the sucrose does not enter the cells during the test, how many…
The cyclic alpha and beta forms of glucose have the same molecular formula. Which structural distinction separates these two forms? A. A different number of hydroxyl groups B. The orientation of the hydroxyl group on carbon1 C. A different total number of…
A small insect is supported by the water surface without breaking through it. Which interaction principally creates the surface tension that supports the insect? A. Attraction of water to cellulose in plant walls B. The thermal motion responsible for…
Two molecules of this amino acid form a dipeptide by condensation. Which labelled group can be removed from one molecule, combining with hydrogen from the other to form water? A. Group A B. Group B C. Group C D. Group D
An enzyme preparation hydrolyses a carbohydrate substrate into smaller sugars. The enzyme concentration and temperature are held constant. Why does this model response reach a plateau? A. The enzyme active sites are occupied almost continuously B. The enzyme…
Which pair of components in double-stranded DNA is linked by hydrogen bonding? A. Uracil and adenine in every DNA base pair B. Guanine and complementary cytosine C. A phosphate and its neighbouring deoxyribose D. A base and the sugar to which it is attached
This sealed apparatus is kept at constant temperature. Initially the liquid levels in the two arms were equal. The diagram shows the later result. Potassium hydroxide absorbs carbon dioxide. What does the result indicate? A. The living seeds produce more…
The table contains model genome sizes for four organisms. Which conclusion is supported? Organism | Genome size / million base pairs Bacterium | 4.6 Insect | 190 Mammal | 2800 Flowering plant | 92000 A. The plant must have exactly thirty times as many…
Which change normally occurs in meiosis I? A. Homologous chromosomes separate, reducing the number of chromosome sets B. All sister chromatids separate to give four nuclei immediately C. The two resulting nuclei acquire identical combinations of parental…
A hypothetical recessive condition occurs only in individuals with genotype rr. Two unaffected Rr parents already have one affected child. What is the probability that their next child is affected, assuming independent fertilizations? A. Zero B. One quarter C.…
Use these DNA profiles to identify the parental pairing consistent with all bands in each child. A. P with X and Q with Y B. P with Y and Q with X C. P with both X and Y D. Q with both X and Y
A sealed terrestrial mesocosm exchanges energy but no matter with its surroundings. Which quantities may change over several days? I. Total carbon in the whole vessel II. Temperature III. Mass of living organisms A. I only B. I and II C. II and III D. I, II…
This model pyramid gives annual energy flow through four trophic levels. Which conclusion follows from the values? A. The pyramid directly gives the number of organisms at every level B. The largest loss shown is reflected sunlight before it reaches producers…
Consumption of fossil fuels has increased greatly since industrialization. How does combustion contribute to the enhanced greenhouse effect? A. Combustion products such as CO₂ absorb outgoing infrared radiation B. Most of the effect comes from preventing…
Which observation is a possible consequence of natural selection over several generations? A. Environmental change creates variation only after reproduction stops B. All produced offspring necessarily survive to breed C. A heritable trait becomes less frequent…
The flight surfaces of birds contain a bony forelimb framework, whereas those of butterflies are extensions of the exoskeleton. How should their adaptations for powered flight be compared? A. They are the same inherited wing structure because both can fly B.…
Amylase hydrolyses starch into maltose. A closed length of standard dialysis tubing contains starch and amylase, with no maltose initially. It is placed in distilled water as shown. Predict the changes after 45 minutes. Each answer lists: starch outside;…
Consider three defensive responses. I. Formation of a fibrin clot over a wound II. Engulfment of microbes by phagocytes III. Antibody production by activated B lymphocytes Which is an antigen-specific adaptive response? A. I and III only B. I and II only C.…
Calculate tidal volume and ventilation rate from this model trace. A. 0.6 L and 12 breaths min⁻¹ B. 2.8 L and 12 breaths min⁻¹ C. 0.6 L and 4 breaths min⁻¹ D. 2.8 L and 4 breaths min⁻¹
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