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nata0808 [166]
3 years ago
15

How does a hydrogen bond form?

Biology
1 answer:
AlexFokin [52]3 years ago
3 0
A hydrogen bond forms from the attractive force between a hydrogen atom covalently bonded to a very electronegative atom.
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Why we used dyes when we prepare onion , human cheek eqithelium smears, and didn’t use it in cork and leaf epidermal cells smear
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Answer:

Explanation:

Staining is done for onion cells to visualize the cytoplasm of yellow and white onions because they are not pigmented. The staining of human cheek cells with methylene blue is necessary to stain the nucleus to get clear image of it under microscope because methylene blue binds to negative charge nucleic acids  

While for leaf epidermal cells smears, staining is not necessary as they are visible under light microscope without staining and they also have pigmented materials inside them such as chlorophyll chloroplast.  The cork cell is a non-living and have a cell wall whose structure is visible under light microscope.  

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Use the drop-down menus to complete the statements. Anthers release pollen, which lands on the of another flower of the same spe
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Answer:

See the answer below

Explanation:

Anthers release pollen, which lands on the stigma of another flower of the same species. The pollen grain produces a pollen tube that grows down the style, to the ovary, and into the ovule. The sperm cell fertilizes the egg cell. The ovule develops into the seed, and the ovary becomes the fruit.

<em>During fertilization in plants, the anther which carries pollen releases pollen grains. Once the pollen lands on the stigma of a flower of the same species, it germinates. The pollen grain produces a pollen tube that grows through the style of the stigma down to the ovary and into the ovule. One of the sperm cells fuses with the egg cell of the ovule to form the zygote while the other sperm cell fuses with the polar nuclei to form the endosperm in a process known as double fertilization. After fertilization, the fertilized ovule becomes the seed and the ovary becomes the fruit. </em>

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What do you need to know

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