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2 years ago

What caused the composition of Earth’s early oceans to transition from dissolved carbon dioxide to dissolved oxygen?A.

2 answers:

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C) It's the most certain answer as all animals are believed to have arise from aquatic unicellular bodies that multiplied and evolved into complex organisms. Like all forms of live they respired and took some millions of years to evolve into land animals thus consuming CO2 into O2.

Tema [17]2 years ago

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Hello.

The answer is: A.Ultraviolet rays from the Sun converted dissolved carbon dioxide to oxygen.

the more carbon dioxide that people pumped into the atmosphere by burning fossil fuels, the more the oceans would absorb. The ocean would continue to soak up more and more carbon dioxide until global warming heated the ocean enough to slow down ocean circulation.

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The plasma membrane of the sea urchin egg ______. A. is outside of the fertilization membrane B. releases calcium, which initiat

Butoxors [25]

The plasma membrane of the sea urchin egg has receptor molecules that are specific for binding acrosomal proteins .

<h3>What is plasma membrane ?</h3>

Plasma membrane is the outermost covering of the body which selectively permits the entry and exit of different type of materials .

Thus ,it is also called as selectively permeable membrane.it also separates the inner and outer environment of the cell .

It also helps in the diffusion process .

<h3>What are sea urchins ?</h3>

Sea urchins belongs to the animalia kingdom , Echinodermata Phylum, and Echinoidea class . they are small marine animals .Sea urchins are spiny , globular .

Learn more about sea urchins here :

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1 year ago

The following sequence of double stranded DNA encodes a hypothetical protein called GEN in a bacteria. Transcription starts at a

vaieri [72.5K]

Answer:

A) AUG GAG GGU

B) N-MET-GLU-GLY-HIS

C) 10 amino acids

D) The stop codon here is UAA, instead of UAG. If a tryptophane residue is added where the stop codon is, the GEN polypeptide would be longer

Explanation:

First we must obtain the the complementary chain or mRNA

A) AUG start codon is complementary to DNA TAC triplet, and GAG is complementary to CTC, and GGU to CCA (running from left to right towards 5'DNA direction (AAGCGGATACCTCCCAGTAGATGCTCCGGGGCTAGTGATTTCGAAC-5)

B) TAC corresponds to Methionine, GAG to Glutamate, GGU to Glycine, and CAU to Histidine

C) UAA is the stop codon, that is complementary where the DNA triplet is ATT. From AUG to UAA, we can have 10 amino acids transcribed

D) If a trp is included where the stop codon is UAA, then the mRNA would be longer with a consequent traduction of a longer GEN polypeptide

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2 years ago

If the extracellular fluid has an excess of sodium ions, a. sodium ions move into cells b. intracellular fluid moves to the outs

Mandarinka [93]

Answer:

b. intracellular fluid moves to the outside of cells

Explanation:

The presence of an excess of sodium ions in the extracellular fluid would make it hypertonic with respect to the intracellular fluid. The concentration gradient would drive the intracellular fluid towards the outside of the cell to balance the concentration of the fluids on either side. The passive movement of fluids occurs across the cells and is driven by the concentration gradient only. The biological membranes are permeable for fluid movement such as the movement of water across it.

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2 years ago

Does our DNA change during our lives?

zmey [24]

No, I wouldn’t think so

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3 years ago

Cuantos cromosomas tiene el sol

Nezavi [6.7K]

Exactly how many chromosomes we are talking about depends on the species. A mosquito has 6 chromosomes, a pea plant has 14, a sunflower 34, a human being 46, and a dog 78. Closely related species tend to have a similar number of chromosomes.

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2 years ago