Biology

Biology, 12.07.2019 02:30, dancemomsrule1

Suppose a dye for staining cells stains the region where ribosomes are made. what would you expect to see inside the stained cells nucleus?

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Biology, 21.06.2019 20:00, skylex

You have been asked to lead a demonstration for the undergraduate microbiology lab course about the uses of negative staining when studying bacteria. a "negative" stain does not stain the bacterial cell itself but stains the space between cells. under magnification, the acidic (negativelycharged) nature of the stain will be repelled by the negatively charged bacterial cell wall and willleave the cell colorless in a stained background. negative stains are used primarily to reveal the presence of negatively charged bacterial capsules; therefore, they are also called capsule stains. encapsulated cells appear to have a halo surrounding them. the negative stain procedure does not require heat fixation, which limits any chances of alteration in bacterial cell shape and size. the bacterial suspension is added to a drop of stain, such as nigrosin or eosin, and drawn across the glass slide using a coverslip.nigrosin staining-not safranin staining-of klebsiella pneumoniae will allow for the visualization of the cell shape and the determination of the presence of a capsule.true/false

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Biology, 05.07.2019 04:00, beverly9662

:1. despite differences in size and shape, all cells have dna and a: a- cell wall b- mitochondria c- cell membrane d- nucleus 2. which of the following is not a part of the cell theory? a- all cells contain a nucleus. b- cells are the basic unit of structure and function in an organism. c- all living things are made of cells. d- new cells are produced from existing cells. 3. when using a light microscope to view a cell she obtained from scraping under her fingernails, mrs. smith notices that the cell lacks a nucleus; therefore, mrs. smith concludes that the cell must be a type of cell. a- animal b- plant c- eukaryotic d- prokaryotic 4. which of the following kinds of cell perform basic functions such as obtaining energy from food? a- plant cells, but not animal cells b- animal cells, but not plant cells c- both plant cells and animal cells d- neither plant cells nor animal cells 5. which cell structures are sometimes found attached to the endoplasmic reticulum? a- chloroplasts b- ribosomes c- nuclei d- mitochondria

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Biology, 05.07.2019 10:00, lexi7149

This is a slide of human cheek cells. after scraping the inside of their mouths, students in ms. gordon's class smeared the swab on a slide and stained them blue. these cells are parts of a large, complex organism, a human. but these cells. like the other cells in the human body all have an important organelle, seen here. it stains dark blue and is the control center of the cell. what is this organelle? a) dna b) cytoplasm c) membrane d) nucleus

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Biology, 08.10.2019 05:00, mahmed78

Astudent is looking through a microscope at stained cells that appear to have a stiff outer edge and smaller structures inside, including a large rounded object near the center. what type of cell would the student expect these cells to be, and why? a prokaryotic, because only prokaryotic cells have cell walls. b prokaryotic, because prokaryotic cells have ribosomes. eukaryotic, because only eukaryotic cells have cell walls. d eukaryotic, because only eukaryotic cells have a nucleus and organelles.

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