Zadanie 1
Which component of a typical animal cell is absent from a bacterial cell? A. Cytoplasmic ribosomes B. A plasma membrane C. Mitochondria D. Genetic material made of DNA
Biology HL Paper 1, May 2023, TZ2
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W bazie 27 zadań z tego arkusza, razem 27 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Genetic diversity generated by meiosis (2).
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Dodaj cały arkusz do zestawuZadanie 3
A neutral solute crosses a membrane through a selective channel. There is initially more of it outside than inside; no other process moves or consumes it. Which description fits this facilitated diffusion? A. ATP must be hydrolysed for every molecule…
Zadanie 4
Which property of chloroplasts supports descent from a formerly free-living prokaryote? A. They retain their own DNA B. They have a cellulose genome C. They contain no ribosomes D. They are surrounded by no membranes
Zadanie 5
A diploid root cell of a plant has 2n = 12. It has completed DNA replication and is in late prophase of mitosis. How many chromatids does it contain? A. 6 B. 12 C. 24 D. 48
Zadanie 6
Which Haworth structure represents beta-D-glucose? A. Structure A B. Structure B C. Structure C D. Structure D
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Zadanie 7
Which description identifies an organism’s proteome? A. All proteins it expresses B. All nucleotide sequences in its chromosomes C. Only amino acids that cannot be synthesized D. Only the folded shape of one enzyme
Zadanie 8
A purified enzyme is tested at a fixed concentration, pH and temperature. Product is measured over very short initial intervals. Why does increasing substrate cease to raise the rate appreciably? A. The enzyme has become the main substrate B. Almost all active…
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Zadanie 9
These tRNAs carry the amino acids shown. Which mRNA sequence encodes the tripeptide phenylalanine–glycine–lysine? Anticodon, written 3′→5′ | Amino acid AAG | Phenylalanine CCA | Glycine UUC | Lysine A. 5′–AAG CCA UUC–3′ B. 5′–TTC GGT AAG–3′ C. 5′–UUC GGU…
Zadanie 10
A green leaf receives only a narrow band of blue light centred near 445 nm. Which plot could show the photosynthesis supported by the wavelengths actually supplied? A. Plot A B. Plot B C. Plot C D. Plot D
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Zadanie 11
Which genetic change produces the altered beta-globin associated with sickle-cell disease? A. Loss of an entire chromosome from every erythrocyte precursor B. A single base substitution in the beta-globin coding sequence C. Addition of a complete second…
Zadanie 12
During which stage do homologous chromosomes pair and exchange corresponding DNA segments? A. Prophase I of meiosis B. Prophase II of meiosis C. Interphase before DNA replication D. Anaphase of mitosis
Zadanie 13
A hypothetical condition is caused by a fully penetrant autosomal dominant allele. The pedigree shows one family; assume no new mutations. What is the probability that the next child of II-2 and II-3 will be affected? A. 0% B. 25% C. 75% D. 50%
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Zadanie 15
Which process decreases the organic biomass retained within a feeding level? A. Fixing atmospheric carbon dioxide into sugars B. Oxidizing organic compounds in respiration and releasing carbon dioxide C. Converting absorbed amino acids into new tissue D.…
Zadanie 17
Which example demonstrates artificial selection? A. A drought favours naturally occurring deeper-rooted plants B. A breeder repeatedly uses the longest-fibred plants as parents C. Birds with poorly camouflaged plumage are more often eaten D. A random storm…
Zadanie 18
In a stable environment, a heritable trait lowers survival and the number of offspring produced. What does natural selection tend to do over generations? A. Decrease the trait’s frequency B. Ensure that every individual acquires a beneficial mutation C. Pass…
Zadanie 19
Which combination occurs during a normal active inhalation? A. External intercostals relax; pressure in the lungs rises above atmospheric pressure B. External intercostals contract; pressure in the lungs falls below atmospheric pressure C. Internal…
Zadanie 20
At which labelled site would a neonicotinoid act to disrupt transmission across this synapse? A. Site B B. Site D C. Site A D. Site C
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Zadanie 21
An IVF protocol includes repeated follicle-stimulating hormone doses before egg collection. What is their intended effect? A. Triggering implantation directly into the ovary B. Stopping all follicle development C. Promoting development of several ovarian…
Zadanie 23
Which change can help convert a eukaryotic primary transcript into a mature mRNA? A. Adding a poly(A) tail at the 3′ end B. Removing every exon and retaining only introns C. Joining amino acids to the 5′ end D. Replacing all uracil with thymine
Zadanie 24
A functional archaeal membrane pump is formed from one folded polypeptide chain. What is the highest level of protein structure present in that single-chain protein? A. Primary only B. Secondary only C. Tertiary D. Quaternary
Zadanie 25
An uncatalysed reaction starts at the middle dashed energy level, reaches the upper dashed level, and ends at the lower dashed level. Which curve could describe the same reaction with an enzyme? A. Curve A B. Curve B C. Curve C D. Curve D
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Zadanie 26
What is the direct role of molecular oxygen in the mitochondrial electron transport chain? A. It is reduced after accepting electrons at the end of the chain B. It splits glucose into pyruvate in the cytoplasm C. It replaces coenzyme A in the link reaction D.…
Zadanie 29
How can the proximity of xylem to phloem help translocation at a sugar-loading region? A. Xylem transfers all its lignin into sieve tubes B. Water can enter the sugar-rich phloem osmotically and help generate pressure C. The two tissues use the same continuous…
Zadanie 31
How does crossing over contribute to variation in gametes? A. It removes all recessive alleles B. It creates recombinant combinations of alleles on homologous chromosomes C. It makes every gamete diploid D. It ensures that all offspring are genetically…
Zadanie 32
In a model insect, dark wings and long antennae are dominant traits. Which cross is most useful for testing whether the two loci are linked? A. A double heterozygote crossed with a double homozygous recessive B. Two double homozygous dominant parents C. A…
Zadanie 33
Which distribution change illustrates stabilizing selection? A. Graph A B. Graph B C. Graph C D. Graph D
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Zadanie 40
Which exchange normally occurs across the placenta? A. Fetal carbon dioxide passes towards maternal blood B. The fetal and maternal circulations merge into one open channel C. All maternal red blood cells enter the fetal circulation D. The umbilical vein…