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4 years ago

How would earths atmosphere be different if organisms capable of photosynthesis has not evolved?

1 answer:

katrin2010 [14]4 years ago

6 0

The Earth's atmosphere would have little or no oxygen. A by-product of photosynthesis is oxygen. Photosynthesis is the process by which green plants use energy from the sun to make their own food in the leaves. The process uses sun light, water and carbon dioxide to yield oxygen and simple sugars. The simple sugars are stored in form of starch for future use by the plants, while oxygen is either used for cellular respiration or released to the atmosphere. The process of photosynthesis adds oxygen to the atmosphere and uses carbon dioxide from the atmosphere.

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Is the binding of a transcription factor to its dna recognition sequence necessary and sufficient for an initiation of transcrip

hram777 [196]

Transcription factors are necessary for an initiation of transcription at a regulated gene but not sufficient.

Transcription is the first step of gene expression in which DNA molecule is copied (transcribed) into RNA (mRNA) by RNA polymerase. The process of transcription is divided into three phases:

1. Initiation

• RNA polymerase with transcriptional factors bind to gene promoter Transcription factors can enhance the interaction between RNA polymerase and a DNA sequence- promoter, encouraging the expression of the gene. Such transcription factors are called activators. Otherwise, when the gene expression is inhibited, factors are called repressors and they bind to sequence –operator.

• RNA polymerase unwinds DNA double helix (transcription bubble is formed)

2. Elongation

• RNA polymerases adds nucleotides complementary to DNA

3. Termination

• RNA polymerase gets to stop codon (transcribes a sequence of DNA known as a terminator)

• Formed complementary RNA strand is released from DNA-RNA complex

6 0

3 years ago

The process of osmosis is best illustrated by the movement of a. water into root hair cells b. oxygen intro red blood cells c. c

barxatty [35]

Answer:

a. water into root hair cells

Explanation:

Osmosis can be defined as a process which typically involves the movement of a solvent molecule such as water through a semi-permeable from a region of high concentration to a region of lower concentration.

Hence, the process of osmosis is best illustrated by the movement of water into root hair cells because they are used by the plants to absorb water from the soil.

3 0

3 years ago

A new object, Object Y, was discovered outside our solar system. Object Y is small and rocky, is not a satellite of any other ob

Leona [35]

Meteors is the correct answer. I’m just going to talk more to get this 20 word limit over so yeah no problem

4 0

3 years ago

Read 2 more answers

Any substance that can be decomposed by bacterial action is biodegradable. <br> a. True<br> b. False

galina1969 [7]

A true a substance that can be decomposed by bacterial

6 0

3 years ago

This has to do with blind spots: What parts of the eye are involved with this inability to see? How do these eye parts function?

Slav-nsk [51]

Answer:

Blindspot

It has a vital role. It is the only way out of the optic nerve. By this hole optic nerve exits from the eye and goes towards the brain.

It can be proved by a simple experiment. A paper sheet is taken. Then a cross and a circle are drawn side by side on that paper. Then we will focus on the cross. Then by closing one eye and by bringing the paper slowly towards our face, the circle will be disappeared at a certain point.

Explanation:

The blind spot is a region on the retina where ganglion cells connect with the optic nerve, and the optic nerve and blood vessels leave the eyeball. There are no receptors in this area so nothing can be translated into vision. That's why the blind spot is unable to see things.

6 0

3 years ago