Zadanie 12
Which shared feature makes mature mammalian erythrocytes and angiosperm sieve-tube elements atypical eukaryotic cells? A. No cytoplasm B. A peptidoglycan wall C. No plasma membrane D. Absence of a nucleus
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Which shared feature makes mature mammalian erythrocytes and angiosperm sieve-tube elements atypical eukaryotic cells? A. No cytoplasm B. A peptidoglycan wall C. No plasma membrane D. Absence of a nucleus
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A membrane protein hydrolyses ATP while transporting calcium from low concentration to high concentration. What type of protein is it? A. An adhesion glycoprotein B. A water channel C. An active-transport pump D. A passive calcium pore
The diagram shows several products of one adult stem-cell lineage. Which classification and location fit the cell? A. Totipotent; circulating plasma B. Multipotent; bone marrow C. Totipotent; bone marrow D. Pluripotent; mature erythrocyte
Which pairing correctly describes how two neuronal channels are opened? A. Nicotinic acetylcholine receptor: voltage; action-potential potassium channel: acetylcholine B. Nicotinic acetylcholine receptor: acetylcholine binding; action-potential potassium…
A cell adjusts its membrane lipids during sustained cold conditions. Which change helps maintain fluidity without requiring a change in protein abundance? A. More peptide bonds in phospholipids B. Replacement of all phospholipids by cellulose C. More saturated…
Which organelle–function statement is correct? A. Golgi cisternae use attached ribosomes to translate exported proteins B. The nuclear envelope exists primarily to generate secretory vesicles C. Rough endoplasmic reticulum is the main site of fatty-acid…
Which property of the nuclear envelope assists chromosome segregation during open mitosis? A. Its phospholipid tails attract cytosolic water B. Its two membranes prevent any membrane remodelling C. Its pores export whole chromosomes to ribosomes D. Its…
A bacterial population accumulates a secreted signal as cell density rises. Once a threshold is reached, many cells activate light production together. Which process is illustrated? A. Quorum sensing B. Incomplete dominance C. Photoperiodic flowering D.…
A culture of luminous bacteria begins emitting light only after reaching a threshold cell density. What mechanism best explains this? A. Accumulated bacterial signals activate light-production genes in the bacteria B. Only one cell detects light and becomes a…