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2 years ago

Which two formulas contain 4 atoms of oxygen

2 answers:

5 0

The structural formula for methane contains symbols for one C atom and four H atoms, indicating the number of atoms in the molecule (Figure 1).

jekas [21]2 years ago

3 0

Answer:

Methane CH4 1 carbon atom : 4 hydrogen atoms

Sulfuric acid H2SO4 2 hydrogen atoms : 1 sulfur atom: 4 oxygen atoms

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Complete the statement to describe the calcium concentration that must be maintained in human body cells.

andrezito [222]

Answer:

The calcium concentration must be greater OUTSIDE

the cell than INSIDE the cell.

Explanation:

Calcium has a vital role in the body, it is necessary for:

exocytosis
muscle contraction
normal excitability of neurons
blood coagulation
building and maintaining bones and teeth
enzymatic activity

4 0

3 years ago

Read 2 more answers

If a wide-spectrum fungicide that kills all fungal species were used extensively in a forest, what effects would you expect the

Ne4ueva [31]

Answer:

It would harm the few plants that benefit from mutualistic relationships with mycorrhizal fungi

Explanation:

Mycorrhizal relationship is a symbiotic relationship between fungi and the roots of higher plants. While the plant provides the fungi with food, the fungi supply the plant with nutrients and water extracted from the soil.

Hence, if a wide-spectrum fungicide is used in a forest and it kills all the fungi in the forest, it will affect all the plants that share beneficial relationship with fungi in the forest.

4 0

3 years ago

Which of the following is not caused by human interaction with the Earth system

Tema [17]

Mountain building and defrostation

7 0

4 years ago

Cyclins are a family of proteins that ________

Ghella [55]

Cyclins are a family of proteins that [ A ] Regulate the cell cycle

6 0

3 years ago

If a SARS-CoV2 virus were to mutate and become and become better at attaching to respiratory cells, how would natural selection

navik [9.2K]

Answer:

Mutations leading to the better attachement of virus to the host cell would allow the virus to spread the infection and leave more progeny. The reproductive fitness of mutant viruses would allow the mutation to spread.

Explanation:

1. The organisms with same resource requirement compete with each other. Viruses are not living things but once inside the host cell, they behave like living things. Rapid multiplication of virus overpopulate the host cells.

2. Genetic variations are added to the viral progeny by random errors during replication of the viral genome. These random variations may impart beneficial trait, harmful feature or remain neutral. If a random mutation in the SARS-CoV2 virus allows it to adhere better to the cells of the respiratory system, the virus would be better able to infect these cells to spread the infection. Once inside the host cells, the mutant virus would leave more progeny. On the other hand, the wild type virus that lack this mutation would have lesser chances of entering the host cells and may or may not replicate.

3. The progeny of the mutant virus would compete better with the non mutant ones due to the presence of same mutation.

4. Differential reproduction and more progeny of the mutant virus would spread the mutation among the virus.

4 0

3 years ago