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At the start of growth, a stored underground tuber supplies a young shoot whose leaves are not yet photosynthetically self-supporting. Which pairing identifies a source and a sink for translocated carbon compounds? A. Source: growing shoot; sink: tuber B.…
How can auxin contribute to a plant’s growth response? A. By permanently preventing cell-wall expansion B. By preventing responses to directional light C. By making all plant organs grow at an identical rate D. By regulating growth associated with the shoot…
Which explanation is consistent with the treatment’s effect on shoot growth? A. The barrier prevents auxin moving from the tip to elongating cells below B. The barrier increases auxin movement and therefore stops elongation C. Growth is prevented because light…
Which genetic explanation is consistent with the many small differences in seed mass in this model crop? A. Only one dominant–recessive gene can produce any quantitative variation B. Several genes contribute to the trait C. A single allele necessarily produces…
A measured pigment trait varies continuously from very pale to very dark in a population, rather than falling into a few distinct classes. Which genetic explanation is most consistent with this observation? A. Contributions from multiple genes B. Only one…
In a model bird population, intermediate clutch sizes have greater reproductive success than very small or very large clutches. After stabilizing selection acts over many generations, what pattern is expected? A. Intermediate clutches disappear first B. Every…
A person encounters a particular pathogen for the first time. Which event is part of the specific immune response? A. The pathogen’s antigen automatically becomes a vaccine inside each cell B. Recognition of its antigens leads to B-cell activation and…
Blood becomes more concentrated than its normal range and ADH secretion increases. Which renal response helps restore water balance? A. The collecting ducts become completely impermeable to water B. All glomerular filtration stops permanently C. The kidney…
Cell P is a normal sperm. Cell Q has a developmental abnormality. Which consequence best explains reduced fertilization ability? A. It cannot efficiently penetrate the egg coverings to reach the egg cell membrane B. It must contain no nucleus C. It has no…
Which pair of labels is correctly matched to the structures in this model bacterium? A. R: ribosome; Q: plasma membrane B. S: mitochondrion; P: nuclear envelope C. Q: cellulose wall; R: chloroplast D. P: nucleolus; S: secretory vesicle