What is th the purpose of the spiral intestine In a shark

Biology

1 answer:

sergeinik [125]4 years ago

8 0

It is twisted to create a greater surface area for digesting and to increase the nutrient absorption.

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When the person from number one was creating "true breeding" lines of plants for certain traits, what method was used?

mafiozo [28]

Complete question:

When the person from number one was creating true-breeding lines of plants for certain traits, what method was used?

A. Self pollination over and over again while discarding plants with unwanted traits

B. Cross-pollination over and over while discarding plans with unwanted traits

C. Allowing for cross-pollination by bees

D. Not allowing the plants to pollinate at all

Answer:

A. Self pollination over and over again while discarding plants with unwanted traits

Explanation:

Due to technical problems, you will find the complete explanation in the attached files.

Download pdf

3 0

3 years ago

Order the steps from arrival of transcription-promoting factors at the eukaryotic DNA gene promoter to synthesis of an mRNA copy

asambeis [7]

Answer:

Explanation:

There are 3 different types of DNA dependent RNA polymerase. RNAP II is the main enzyme synthesizing mRNAs.

1. Signals for initiation of transcription

Promoters: there are certain specific areas on the DNA that act as starting signals for initiation process.

The DNA polymerase attaches to the promoter site on the template DNA strand.

TATA Box: upstream of the transcription start site is 5'-TATAAA-3' it is referred to as the TATA Box. It acts as a signal for the start region.

2. Initiation of Transcription. The DNA helix unwind, and the RNAP binds to the promoter site on the 5' end DNA with the help of sigma factor. RNAP reaches the appropriate site of the gene and add the first nucleotide of the mRNA.

3. Elongation of Transcription: the RNAP moves along the DNA template, new nucleotides are incorporated in the nascent mRNA, one by one, according to the base pairing rule.

4. Termination of transcription: specific signals are recognized by the termination protein (Rho factor). When it attaches to the DNA, rnap can't move further. So the enzyme dissociate from DNA and consequently newly formed RNA is released.

4 0

4 years ago

One parent has type A blood and the other has type B. What are their genotypes if they produced children whose blood types were

zhenek [66]

Answer:

iAiA and iBiB

Explanation:

Blood type in humans is controlled by a gene with three alleles namely: iA, iB, and i. Alleles iA and iB are dominant over allele 'i' but codominant. The following are the allelic combinations of the genotype and the resulting blood types:

iAiA or iAi - type A

iBiB or iBi - type B

iAiB - type AB

ii - type O

According to this question, one parent has type A blood and the other has type B. If all the offsprings of these parents have blood type AB, this means that the parents must have a genotype of iAiA and iBiB respectively.