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3 years ago

To perform active transport, cells use _____.

Biology

2 answers:

vekshin13 years ago

4 0

Atp and transport proteins because active transport requires atp and transport proteins help

telo118 [61]3 years ago

4 0

Answer: ATP and transport proteins .

Explanation:

Active transport is characterized by the movement of substances and ions against the concentration gradient, that is, it always occurs from places where they are less concentrated to places where they are more concentrated. The sodium-potassium pump is an example of active transport. Sodium concentration is higher in the extracellular environment while potassium is higher in the intracellular environment. Importantly, the energy required for this change comes from the breakdown of the ATP (adenosine triphosphate) molecule into ADP (adenosine diphosphate) and phosphate. That is, energy is derived from the degradation of ATP or another high energy phosphate compound, depending on transport proteins.

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Why is it useful to have lots of capillaries inside each of the villi? (villi are things on the inner surface of the small intes

Lisa [10]

This is probably to increase blood supply in the intestines. Blood is a transporter of digested food materials.

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3 years ago

A geneticist is studying two traits in the fruit fly - eye color and wing shape. They perform a dihybrid cross. If the genes for

Len [333]

Answer:

3/16

Explanation:

According to Mendel's law of independent assortment of genes, when a dihybrid cross involves two genes that assort independently and one of the parents is dominant for the two genes and the other is recessive, the phenotypic ratio of the offspring at F2 would be 9:3:3:1. The proportion of the offspring with the dominant parental traits would be 9/16, those with the recessive parental traits would be 1/16, while those with mixed traits would be 3/16 each.

Assuming the eye color is represented by E and the wing shape is represented by W. At F2

EeWw x EeWw

E_W_ - 9/16 (dominant for both eye color and wing shape)

E_ww - 3/16 (dominant for eye color and recessive for wing shape)

eeW_ - 3/16 (recessive for eye color and dominant for wing shape)

eeww - 1/16 (recessive for both eye color and wing shape)

Hence, the proportion of the offspring with dominant phenotype for eye color and recessive phenotype for wing shape would be 3/16.

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3 years ago

DNA compaction into chromosomes is dependent upon a family of proteins called histones. These essential DNA organization protein

irinina [24]

Answer:

Explanation:

The history protein H2A, H2B, H3 and H4 forms an octamer ( 2 each of the four histones) around which the DNA is wrapped. They help in packaging the DNA allowing for compaction of the DNA

Linker histone H1 and a length of DNA (linker DNA) links two nucleosomes together and they also play essential role in chromatin strucrure, stabilizing it and also modulating accessibility of the DNA to biological processes.

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3 years ago

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Ludmilka [50]

This is very true but I don't see the question

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3 years ago

Read 2 more answers

Determine whether the following events occur during initiation, elongation, or termination. This is regarding protein synthesis.

erik [133]

Answer:

The provided events can be classified as:

Initiation

In prokaryotes, the Shine-Dalgarno sequence pairs with rRNA.
In E. coli, mRNA binds to the 30S ribosomal subunit.

Elongation

In E. coli, EF-Tu delivers an aminoacyl-tRNA to the ribosome
Initiator tRNA enters the P site.
In E. coli, EF-Tu hydrolyzes.
Translocation occurs

Termination

The ribosome has mRNA, an empty A site, and deacylated tRNA in the P site

Translation is the process by which polypeptide chain is synthesized based on the codon sequence of the mRNA (messenger ribonucleic acid).

It is divided into three stages:

Initiation: The small and large sub-units of the ribosome get assembled around the initiation codon. It forms three sites (A, P, and E site) for interaction tRNA and mRNA.

Elongation: Specific charged-tRNA enters from A site and transfers its amino acid to the growing polypeptide chain in P site. Uncharged tRNA exit from the E site. Ribosome moves or translocates to the next codon.

Termination: As soon as ribosome reaches the termination codon, it releases the newly synthesized polypeptide chain.

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3 years ago