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3 years ago

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Although the most frequent forms of down syndrome are caused by a random error, nondisjunction of chromosome 21, down syndrome o

ccasionally runs in families. the cause of this form of familial down syndrome is ________.

1 answer:

den301095 [7]3 years ago

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Genetic disorder facts

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As a species evolve, they develop ________ and ________ others

Leno4ka [110]

Your answer would be: New traits, lose. This is because evolution is when a species changed and adapts to changes in their environment. During this process, they may lose old traits that are no longer useful.

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3 years ago

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Explain how is the process of photosynthesis central in sustaining life on Earth?

Lilit [14]

The sun rays are received by the plants and explell oxygen and we breath the oxygen to be able to survive

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3 years ago

An example of a monotreme is a(n)<br> A. elephant.<br> B. platypus.<br> C. duck.<br> D. kangaroo.

Monica [59]

The answer is B. Platypus, as they are mammals that lay eggs.

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3 years ago

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A - DNA as the inheritance materials B - RNA as the inheritance materials C - The formation of organic molecules, e.g. nucleic a

Stels [109]

EXPLANATION:

There are 2 types of nucleic acids: DNA(deoxyribonucleic acid) and RNA(ribonucleic acid).

Living organisms have their genetic material in their DNA. Viruses use RNA as their genetic material but are usually called non-living things( because they can't reproduce without help from a host).

The function of nucleic acids has a progression from DNA to RNA to proteins. This is called the central dogma of molecular biology.

Nucleic acids are formed by a linkage of polynucleotide chains with phosphodiester bonds. These polynucleotide chains are formed from monomers called NUCLEOTIDES.

A nucleotide is made up of 3 parts:

i) a nitrogenous base

ii) a five-carbon sugar

iii) at least one phosphate group.

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3 years ago

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The area between Z lines is the

Nataly_w [17]

Answer:

Sarcomere

Explanation:

A myofibril or muscle fiber under an electron microscope shows alternate light band and dark bands. These bands give the skeletal muscle and cardiac muscle a striated appearance. The light band is called the I- band or isotropic band, and the dark band is known as A- band or anisotropic band. In the center of the I-band Z-line is present. It is discovered from a German term Zwischenscheibe (between the disc). The portion of myofibril between one Z-line to the next Z-line is called sarcomere.

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3 years ago