Zadanie 1
Which cellular process is anabolic? A. Hydrolysis of a storage polysaccharide B. Breakdown of an amino acid for respiration C. Assembly of amino acids into a new enzyme D. Oxidation of a respiratory substrate to smaller products
Biology SL Paper 1, May 2022, TZ2
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Dodaj cały arkusz do zestawuZadanie 4
Two nutrient-broth cultures are held in identical open swan-neck flasks that admit air but trap airborne particles. Broth in P is boiled first; broth in Q is not. After six days P remains clear while Q contains many microorganisms. Which conclusion is…
Zadanie 6
A root contains several specialized cell types that originated by division of the same zygote. What generally explains their different functions? A. Each type has retained only one gene B. Different patterns of gene expression produce different proteins C.…
Zadanie 7
Which property of glucose permits it to be carried dissolved in blood plasma? A. It is completely non-polar B. Its molecules are too large to interact with water C. Its polar groups interact with water molecules D. It is a lipid with no oxygen atoms
Zadanie 8
What makes triglycerides efficient long-term energy stores compared with carbohydrates? A. Triglycerides yield more energy per gram on complete oxidation B. Triglycerides contain no chemical bonds C. Carbohydrates cannot be respired in animals D. Every…
Zadanie 10
An enzyme converts a finite amount of substrate to a stable product in a closed assay. Initially no product is present. Which curve best represents product accumulation as substrate becomes limiting? A. Q B. R C. P D. S
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Zadanie 11
At a DNA replication fork, what is the role of helicase? A. Joining adjacent amino acids into a protein B. Adding new nucleotides to the growing daughter strand C. Separating the parental strands by disrupting base-pair hydrogen bonds D. Making an RNA copy of…
Zadanie 12
An aquatic shoot is tested at several sodium hydrogencarbonate concentrations using the apparatus shown. The trial duration, illumination and temperature are kept constant. Which measurement is the dependent variable? A. The concentration assigned to each…
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Zadanie 13
Which description best defines alleles of a gene? A. Alternative versions of that gene with differences in DNA sequence B. Different organelles containing exactly the same protein C. All unrelated genes found on one chromosome D. Proteins that must always give…
Zadanie 15
This pedigree shows a fully penetrant inherited condition. Assume no new mutations. Which pattern fits it? A. Autosomal dominant inheritance B. Y-linked inheritance C. X-linked dominant inheritance D. Autosomal recessive inheritance
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Zadanie 16
A livestock procedure begins with fertilization, followed by divisions and separation of the cells shown. What is structure X before separation? A. A cluster of unfertilized eggs B. An early embryo C. One ovarian follicle D. A cluster of independently…
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Zadanie 17
Quadrats are scored for the presence of two grassland plants. A chi-squared test of association gives χ2 = 1.87; the critical value at the chosen significance level is 3.84. What conclusion is justified? A. The two plants are proved to occupy identical…
Zadanie 18
Which forms of energy enter the producer at X and pass to the primary consumer at Y? A. X: thermal; Y: nuclear B. X: chemical; Y: light C. X: light; Y: chemical D. X: kinetic; Y: thermal
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Zadanie 19
Which listed human activity is the largest direct driver of the recent increase in atmospheric carbon dioxide? A. Expanding long-lived woodland B. Capturing carbon dioxide in permanent geological stores C. Burning coal, petroleum and natural gas D. Reducing…
Zadanie 20
Over many generations, growers repeatedly choose beet plants with high sugar yields as parents for the next crop. What process is this? A. Random mating without selection B. Selective breeding C. Convergent evolution caused only by drought D. A single acquired…
Zadanie 23
Which feature supplies the differences on which natural selection can act? A. Only characteristics acquired through exercise during one lifetime B. The complete absence of differences among individuals C. A guarantee that every organism has a very long…
Zadanie 25
The recording covers rest, exercise from minute 6 to minute 22, and recovery. Which brain region sends autonomic signals that adjust the sinoatrial node during these changes? A. The medulla B. The pineal gland C. The thyroid gland D. Subcutaneous adipose…
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Zadanie 27
At 2.5 s the pressure shown drives air out of the lungs. Which muscle activity would support forced expiration? A. Contraction of the diaphragm and external intercostals B. Relaxation of every respiratory muscle while thoracic volume increases C. Contraction…
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Zadanie 29
Which interaction exemplifies negative feedback in regulation of the ovarian cycle? A. Oestradiol enhances all gonadotropin secretion at every concentration and stage B. FSH permanently prevents every follicle from growing C. All progesterone is produced only…
Zadanie 30
Which labelled structure secretes a fluid that contributes to semen? A. R B. S C. T D. U
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