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3 years ago

Name 5 major events occured during the precambrian era?

1 answer:

7 0

1) the solar system and light formed.
2) Earth's formation, approximately 4,5 billion years ago.
3) the creation of the atmosphere through volcanic out gassing; Earth's primitive atmosphere made a transition to an oxygen rich atmosphere.
4) formation of landmass and oceans.
5) the creation of life; there is evidence of the earliest appearance of eukaryotes.

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The outer boundary of most cells is called

Gre4nikov [31]

Answer:

Cell membrane

Explanation:

The cell membrane is a flexible and permeable skin surrounding a cell.

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2 years ago

What part does chlorophyll play in photosynthesis?

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Answer:

it captures the sun's energy

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2 years ago

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Can you explain how more life-forms were able to create because of cyanobacteria PLEASE HELP

Ainat [17]

The cyanobacteria changed the composition of the earth’s atmosphere by evolving oxygen in what is referred to as the Great Oxygenation Event. This also allowed the ozone to be formed and block off most of the UV rays that are destructive to genetic material. Life was, therefore, also able to exist on land other than in water.

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2 years ago

Biological muscle cells can be thought of as nanomotors that use the chemical energy of ATP to produce mechanical work. Measurem

bearhunter [10]

Answer:

The answer is 6.4 × $10^{-20}$ Joules

Explanation:

This question wants to effectively test your knowledge of the names of the negative powers of 10, so first of all, before calculating, let me explain what each of the symbols in the units given in the question means:

Force = 8.0 pN = 8.0 × $10^{-12}$ N

displacement = 8.0 nm = 8.0 × $10^{-9}$ N

Now let us calculate the work.

work = Force × Displacement

work = 8.0 × $10^{-12}$ × 8.0 × $10^{-9}$ = 64 × $10^{-21}$

= 6.4 × $10^{20}$ Joules (in standard form)

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3 years ago

Which of the cell junctions is involved in creating a barrier between cells?

aleksklad [387]

Tight junctions are cell junctions that seal tissues. These junctions form protective and functional barriers.

The cell junction that is involved in creating a barrier between cells is the TIGHT junction.

The tight junctions are cell-cell adhesion structures implicated in cell polarity and signaling.

On the other hand, adherens junctions are cell junctions required for maintaining contact inhibition.

Finally, desmosomes are intercellular junctions that bind intermediate filaments of the cytoskeleton with cadherin proteins.

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2 years ago