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Leona [35]
3 years ago
12

People with Down syndrome usually have ______ of the 21st chromosome.

Biology
2 answers:
Ivahew [28]3 years ago
7 0
People with Down syndrome usually have trisomy of the 21st chromosome.
Elena-2011 [213]3 years ago
6 0
It is caused by a trisomy in the 21st chromosome 
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Which is the best example of a eukaryote?​
Hitman42 [59]

Answer:

A

Explanation:

Eukaryotic cells have the nucleus enclosed within the nuclear membrane.

The cell has mitochondria.

Flagella and cilia are the locomotory organs in a eukaryotic cell.

A cell wall is the outermost layer of the eukaryotic cells.

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3 0
1 year ago
A spinal-epidural, also called a(n) __________ epidural, is a system of administering continuous doses of anesthetic to a woman
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3 years ago
WHAT IS ANIMALS - NERVOUS SYSTEM​
Murrr4er [49]

Answer:

The nervous system is the part of an animal's body that coordinates its behavior and transmits signals between different body areas.

8 0
3 years ago
Which of the following supports the idea that the genetic code is common to all living things? All living things have -
Ne4ueva [31]

Answer:

The statement that supports the idea that the genetic code is common to all living things is All living things have genes that use the same nitrogenous bases (choice B).

Explanation:

All living organisms possess DNA, a nucleic acid molecule that contains all the genetic information of living beings.  This information is transcribed into mRNA, where it becomes the genetic code that determines the synthesis of biomolecules, such as proteins.

The DNA molecule is made up of sequences of four nitrogenous bases: adenine, guanine, thymine and cytosine. <u>These nitrogenous bases are common in the DNA of all living organisms</u>.

Since genes consist of DNA fragments, with specific sequences of the same nitrogenous bases, then it is true to state that all living things have genes that use the same nitrogenous bases.

The other options are not correct because:

<em>     A. Living organisms have different ways of reproduction. </em>

<em>     C. The way living things use energy is different, and there is no evidence that the genetic code is common to all of them. </em>

<em>     D. The way organisms adapt is not supported by the fact that they possess a common genetic code.</em>

3 0
3 years ago
A hypothetical poison prevents nucleoli from carrying out their functions. which organelles would be affected by this poison?
expeople1 [14]
The cell organelle that will be affected by this poison is the ribosomes. This is for the reason that, it is the nucleoli that produce the ribosomal sub-units which are pull together to form ribosomes. Nucleoli produce ribosomal sub units from protein and ribosomal RNA, it then go direct the sub-unit to the interior of the cell where they are assemble into ribosomes.  
5 0
3 years ago
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