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vagabundo [1.1K]
3 years ago
10

?????? help ????????!!!!!!

Biology
2 answers:
alexira [117]3 years ago
6 0

Answer:

2 and 4

hope this helped!

baherus [9]3 years ago
3 0

Answer:

I believe that the correct answer would be B) 1and 4

Explanation:

This is due to how both are shelled aquatic organisms. Plz tell me if I'm wrong.

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What is the energy of a photon first used to do in photosynthesis?
yuradex [85]
The energy from sunlight comes in the form of photons, and this energy is used in the light dependent reactions of photosynthesis. The first function carried out by the photons in energizing electrons in the chlorophyll. The energized electron travels through the electron transport chain and subsequent steps are carried out to utilize this energy to form ATP.
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3 years ago
A gene on human chromosome 15 is expressed throughout the body. However, in the brain, only the maternal copy of the gene is exp
lord [1]

Answer:

C) Through genomic imprinting, methylation regulates expression of the paternal copy of the gene in the brain.

Explanation:

The pattern of gene expression wherein either paternal or maternal gene is expressed in specific cells while the other one is prevented from expression is known as genomic imprinting.

In the given example, the maternal copy of the gene on chromosome 15 is expressed in brain cells while its paternal copy is not expressed in these cells. Hence, the pattern of expression of this gene is regulated through genome imprinting. One of the mechanism is methylation of cytidine residues of CpG islands of the DNA that are more frequently present within promoters of the genes.

When the cytidine residues of these sequences are methylated into 5-methylcytidine, the transcription factors do not bind to these promoters preventing the expression of these genes.

Hence, methylation of cytidine residue in CpG islands of the promoters of the gene present on chromosome 15 could have silenced its expression in brain cells.

6 0
3 years ago
What are the three stages of photosynthesis ​
AnnZ [28]

Absorption of light electron transport leaning to the reduction generation of ATP and conversion of CO2 into carbohydrate

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How do natural disasters weaken a community’s social infrastructure?
Black_prince [1.1K]

Answer;

Natural disasters can cause billions of dollars in property damage.

Explanation;

-Natural disasters are disasters that are caused by nature, not by human. they include; Earthquakes, tornadoes, hurricanes, tsunamis, volcano eruptions, floods, wildfires, etc. Natural disasters can cause billions of dollars in property damage. Systems are unbalanced by the damage caused by natural disasters. The social infrastructure of a community includes social assets such as schools, hospitals, prisons and community housing. Such places are damaged in natural disaster, adversely affecting the community.

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What type of organism uses chitin for structure and support?
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Answer:

fungi

Explanation:

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