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3 years ago

Pre-mRNA contains non coding regions called:________.

Biology

1 answer:

tekilochka [14]3 years ago

3 0

Answer:

a) introns

Explanation:

In molecular terms, a gene can be defined as a segment of DNA that is expressed to give a functional product, which can be an RNA or a polypeptide. Large amounts of non-coding DNA can be found within the majority of eukaryotic genes. These genes have a divided structure in which the segments of coding sequence (called exons) are separated by non-coding sequences (called introns). The complete gene is transcribed to produce a long molecule of RNA (called pre-RNAm) which will suffer a series of changes before leaving the nucleus. One of these modifications is called splicing, in which the introns are removed. Therefore, only exons are included in the RNAm.

The biochemical analysis of nuclear extracts has revealed that splicing occurs in big complexes, called spliceosomes, formed by small nuclear ribonucleoproteins (snRNPs) and 5 types of small size nuclear RNA (RNAsn).

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Living organisms increase in complexity as they grow. True or False

olga55 [171]

Answer:

True.

Explanation:

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4 years ago

A woman with type A blood (whose father was type O) has children with a man that has type O blood. Both individuals are heterozy

Fantom [35]

Answer:

Explanation:

A woman with type A blood (whose father was type O) meaning her genotype is AO mates with

Man that has type O blood (OO genotype)

Both are heterozygous for MN blood group and both also heterozygous for the FUT1 gene controlling the synthesis of the H substance (Hh)- which determines the expression of the A and B antigen.

Cross

A O M N H h

O AO OO M MM MN H HH Hh

O AO OO N MN NN h Hh hh

Type A- 1/2 O-1/2 type M- 1/4 MN-1/2 N- 1/4, type H- 3/4 h-1/4

Type A with M antigen:

1/2*1/4*3/4 = 3/32

Type A with M and N antigens:

1/2*1/2*3/4 = 3/16

Type A with N antigen:

1/2*1/4*3/4 = 3/32

Type O with M antigen:

1/2*1/4*3/4= 3/32

Type O with M and N antigens:

1/2*1/2*3/4 = 3/16

Type O with N antigen:

1/2*1/4*3/4 = 3/32.

The 3/4 value comes from the expression of Hh-3/4 (this determines if the A and B Angie will be expressed).

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3 years ago

What is the third type of variation in Mendel's theory?

Nikitich [7]

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4 years ago

Describe protons location charge mass

Damm [24]

Answer:

Protons are found in the nucleus of the atom. This is a tiny, dense region at the center of the atom. Protons have a positive electrical charge of one (+1) and a mass of 1 atomic mass unit (amu), which is about 1.67×10−27 kilograms.6

Explanation:

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3 years ago

Which time period saw the loss of 96% of all marine species and 70% of all terrestrial species?

kolbaska11 [484]

Answer: the Permian–Triassic extinction event ; {"end of the Permian era"} .
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4 years ago

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