<span>A water molecule is a polar molecule because ot the shape of its molecule. One side of the water molecule is positively charged while the other is negatively charged. The oxygen and the hydrogen atom in water shared electrons by covalent bonding, the oxygen atom has a slight negative charge and attract most of the electron to itself.</span>
Stalactite.
<u>Stalactite:</u>
- Often, stalagmites develop up from the cave floor, whereas stalagmites typically grow down from the cave roof.
- It's simple to distinguish between the two since stalagmites have a "G" for ground and stalactites have a "T" for top.
- Typically made of calcium carbonate, stalagmites can also be made of lava, mud, peat, pitch, sand, sinter, and amber.
- A single drop of water rich in minerals is the origin of all limestone stalactites.
- The smallest ring of calcite is left behind by the falling water drop.
- Another calcite ring is left behind with each new drop of water that develops and drops.
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Answer:
B
Explanation:
RNAi is a cellular mechanism for post-transcriptional gene silencing. After transcription of a gene into mRNA, small interfering RNA (siRNA) and microRNA (miRNA) can target the mRNA to form dsRNA. This mRNA then becomes a target of ribonucleases such as the Dicer that break it apart. These mRNA, therefore, do not reach the cytoplasm for translation by ribosomes. This mechanism is hence harnessed and manipulated by scientists to study genes by silencing them.
Answer:
Plant cells have a cell wall, but animals cells do not.
Plant cells have chloroplasts, but animal cells do not.
Plant cells usually have one or more large vacuole(s), while animal cells have smaller vacuoles, if any are present.
Explanation:
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<span>https://quizlet.com/35658769/chapter-12-flash-cards/</span>
