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Dodaj cały arkusz do zestawuEqual 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…
At standard pressure, water is liquid from about0°C to100°C, whereas methane is liquid only from about−182°C to−161°C. Which feature helps explain the greater temperature interval for liquid water? A. Fewer atoms automatically making any liquid more stable B.…
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…
Chromosomes from a bacterium and a yeast are compared. Which feature can both have? A. A nucleus surrounding every individual chromosome B. Identical numbers of centromeres C. A requirement that every chromosome occur in a homologous pair D. DNA containing…
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 fungus releases enzymes into fallen leaf litter and absorbs soluble products of the external breakdown. Which nutritional mode is illustrated? A. Detritivory by ingestion B. Photoautotrophy C. Holozoic predation D. Saprotrophy
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;…
Why is an antibiotic directed at bacterial metabolism ineffective against an influenza virus? A. All viruses have become resistant by previously surviving antibiotics B. The virus lacks the independent metabolic machinery targeted by the drug C. Every virus…
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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