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Dodaj cały arkusz do zestawuIn a freshwater unicellular organism, the contractile vacuole repeatedly collects and expels excess water. Which life function is most directly served? A. Maintaining a stable internal environment B. Producing daughter cells C. Obtaining organic food by…
A gland cell makes proteins for export. Which organelle belongs at Y in this simplified processing route? A. Lysosome carrying out digestion B. Golgi apparatus C. Nucleolus D. Mitochondrion
Which observation provides evidence that very different organisms descend from common ancestors? A. All organisms synthesize exactly the same set of proteins B. All cells have identical sizes and shapes C. A given codon usually specifies the same amino acid…
A model antibiotic prevents bacterial transcription. Which event would it block directly? A. Joining amino acids by a ribosome B. Pairing an anticodon with an mRNA codon C. Separation of replicated chromosomes into daughter cells D. Production of an RNA copy…
An illuminated aquatic plant releases gas bubbles into the surrounding water. Which process accounts for the oxygen in these bubbles? A. Water molecules are split during photosynthesis B. Glucose molecules release oxygen during ordinary aerobic respiration C.…
Which pair of highlighted groups can make the peptide link between the two amino acids? A. Q and S B. P and S C. Q and R D. P and R
Which explanation is consistent with the labelled rate curve? Substrate is supplied in excess in each test. A. At Q, molecular kinetic energy cannot increase any further B. At S, the curve proves that all substrate has been consumed C. At R, denaturation has…
Which triplet can occur in an RNA molecule but is not a normal DNA triplet? A. GTA B. ACG C. TGC D. GUA
The overlapping sets list products associated with three respiratory pathways. Which sets represent pathways that can operate in human skeletal muscle during exercise? A. P and Q B. P and R C. Q and R D. P, Q and R
A child has three copies of chromosome 18 after an error during formation of a parental gamete. Which event could have produced that gamete? A. Homologous chromosome pairs failed to separate during anaphase II B. Both homologues moved to the same pole in the…
In a model cattle population, animals with both red and white hairs are crossed. Their offspring include 46 with both colours, 23 with red hairs only and 21 with white hairs only. Which explanation fits these results? A. The mixed coat must result from an…
What feature is shared by a leaf-litter detritivore and a saprotrophic fungus? A. Both must secrete all digestive enzymes outside their bodies B. Both obtain their carbon entirely by fixing carbon dioxide C. Both occupy the producer level in every food web D.…
A sealed terrarium receives light but no added material. Which observation best supports its continued functioning over many months? A. Mineral nutrients released from wastes and dead matter are reused by plants B. The number of species rises, even if…
A domesticated dairy breed consistently produces much more milk than its wild relatives. Which process most directly explains development of the breed? A. Geographical isolation without selection B. Artificial selection across generations C. Independent…
Researchers compare a homologous protein across several species to investigate ancestry. Which comparison provides the relevant molecular evidence? A. The number of molecules expressed in response to a temporary environmental change B. The amount of the…
Which signal is expected to increase heart rate as part of preparation for vigorous activity, rather than potentially increase or decrease it depending on the pathway? A. Any nervous signal from the medulla, regardless of pathway B. A fall in the body’s oxygen…
The diagram represents a constructed untreated HIV infection. Which consequence is most consistent with the blood-component trend late in the record? A. Reduced ability to mount effective antibody responses against infections B. Failure of oxygen transport…
At which marked region would a chemical signal normally pass from one neuron to the next? A. D B. C C. A D. B
In a model investigation, compound Q reduces liver-cell responses to glucagon. The results in diabetic animals are shown. What is a supported explanation for the treatment effect? A. The compound must directly stimulate pancreatic insulin release B. The…
An IVF protocol first suppresses the usual ovarian hormone cycle, then administers hormones to stimulate the ovaries. What is the purpose of this sequence? A. Stimulate endometrial thickening first, then prevent more than one follicle developing B. Trigger an…
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