What are three anatomical features that birds share with their theropod ancestors

1 answer:

6 0

Three anatomical features that birds share with their theropod ancestors are:
1. they had light, hollow bones
2. they rearranged hip and leg muscles because this of improved bipedal movement
3. they had their flight oriented with the use of wings for balance

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True or false? One possible way to alter chromatin structure such that genes could be transcribed would be to make histone prote

Dmitrij [34]

Answer:

False

Explanation:

The histones that are more positively charged, tight hardly to negatively charged DNA. So, enzymes, such as acetyltransferases, that reduce the positive charge of histones promote transcription.

Chromatin structure and its modifications can change the package of the DNA and consequently, alter the gene expression. The most common modifications of the chromatin are covalent modifications such as acetylation/deacetylation (by acetyltransferases and eacetylases), methylation (by methyltransferases), and phosphorylation (by kinases). This is the way of gene expression regulation.

The effects of modifications are different, for example methylation promotes condensation of the chromatin and as a consequence, prevents binding of transcription factors to the DNA (transcription is repressed).

Acetylation loosens the association between nucleosomes and DNA (because it neutralizes the positive charge of histones) and consequently promotes transcription. Deacetylation is a process opposite to acetylation.

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2 years ago

When a cell was examined under a microscope, it was found that it did not have a cell wall . Which of these is likely to be miss

shtirl [24]

Answer:

When a cell was examined under a microscope, it was found that it did not have a cell wall . It has a cell membrane which shows the viewed cell under microscope is an animal cell

Explanation:

Only plant cell has cell wall which gives rigidity and shape to the cell unlike animal cell which has a cell membrane. The cell would comprise of chloroplast, nucleus, golgi apparatus, mitochondria among others

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2 years ago

Which of the definitions below best defines a mutation?

victus00 [196]

The correct answer is: A. A change in a cell's genetic material.

Mutations occur in DNA as a result of mistakes during the DNA replication (when repair mechanisms don’t fix it) or as the result of environmental factors (e.g. UV light). Mutations can have positive impact, by increasing the genetic variation or can have negative effect, causing the diseases or cancer.

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3 years ago

The industrial revolution did not affect ?

Sholpan [36]

Answer:

English settlement of the new world was not an effect of the industrial revolution.

Explanation:

English settlement came into being before 100 years of the industrial revolution and it was an outcome of the consequences of mercantilism as the most prevailing economic model in the Europe establishment.

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Help please, brainliest will be MARKED ! : )

Butoxors [25]

Answer: A.) Thin

Explanation: According to the graph, on day 20 there are more aliens in the thin form than in either of the other two forms. So the form with the highest probability is the thin form.

Hope this helps : )

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2 years ago