____ are cells that lay the framework for new phloem and xylem in vascular plants. Prior to the differentiation of these cells, their precursors transported auxin out of immature leaves
Fill in the blank with the appropriate word.
Procambial cells
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Zip1 is a protein in yeast that is required for synaptonemal complex formation. Assuming synaptonemal complexes are required for meiosis in yeast, where do you predict these cells arrest (stop progressing through meiosis)?
A. Prometaphase of meiosis I B. Metaphase of meiosis I C. Metaphase of meiosis II D. Between the zygotene and pachytene stages E. Diakinesis
A mycologist visits your biology class and discusses her research on a particular fungus that lives on the bark of damaged spruce trees. She explains that the fungal hyphae of her research organism is heterokaryotic. You raise your hand and request that she define that word. Her correct response is
A. heterokaryotic means that the nuclei of the fungal hyphae are genetically the same. B. heterokaryotic means that the nuclei of each compartment of the hyphae are genetically distinct. C. heterokaryotic means that each compartment of the hyphae contain two distinct nuclei. D. heterokaryotic means that each compartment of the hyphae contains only one nucleus.
What is a membrane potential?
What will be an ideal response?
Which of the following types of microscopes provides a 3-dimensional image of the surface of cells and viruses?
A. Transmission electron microscope B. Scanning electron microscope C. Brightfield microscope D. Darkfield microscope