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olya-2409 [2.1K]
3 years ago
6

In order to provide sufficient food for a group of indigenous people in the Amazon, a section of rainforest will be cut down to

make space for agricultural land. The decrease in biodiversity is a(n) _____ between conservation and economic development.
Biology
1 answer:
SVEN [57.7K]3 years ago
8 0

A trade-off is the right answer.

A trade-off) is a situational determination that includes reducing or dropping a degree, amount or resources of a set in return for accumulations in other perspectives.

People in the Amazon performs the task of logging that is the cutting of the trees and storing the wood onto cars or wagons for the purpose of cleaning the forests for agricultural production to meet the demand of people for food. However, this activity of people in Amazon has caused a major problem of deforestation. Thus, the reduction in biodiversity is a trade-off between protection and economic expansion.

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As you just learned, in real ecosystems, trophic efficiencies usually vary from about 5% to about 20%. as a result, net producti
konstantin123 [22]
When energy passes from one trophic level to the next, I would guess that the two factors which decrease the total amount of energy from being passed up are: 
1. An organism does not assimilate all the energy of food consumed. Within a consumer, digestion and assimilation of energy is not 100% efficient: some of the energy is lost.
2. A large proportion of energy assimilated by a producer and consumer is lost through respiration, i.e., day-to-day maintenance of metabolic processes.
6 0
3 years ago
Explain how we know that DNA breaks and rejoins during recombination.
alisha [4.7K]

Answer:

It occurs through homologous recombination

Explanation:

GENERAL RECOMBINATION OR HOMOLOGIST

           Previously we defined its general characteristics. We will now describe a molecular model of this recombination, based on the classic Meselson and Radding, modified with the latest advances. Do not forget that we are facing a model, that is, a hypothetical proposal to explain a set of experimental data. Not all points of this model are fully clarified or demonstrated:

           Suppose we have an exogenote and an endogenote, both consisting of double helices. In recombination models, the exogenote is usually referred to as donor DNA, and the endogenote as recipient DNA.

1) Start of recombination: Homologous recombination begins with an endonucleotide incision in one of the donor double helix chains. Responsible for this process is the nuclease RecBCD (= nuclease V), which acts as follows: it is randomly attached to the donor's DNA, and moves along the double helix until it finds a characteristic sequence called c

Once the sequence is recognized, the RecBCD nuclease cuts to 4-6 bases to the right (3 'side) of the upper chain (as we have written above). Then, this same protein, acting now as a helicase, unrolls the cut chain, causing a zone of single-stranded DNA (c.s. DNA) to move with its 3 ’free end

2) The gap left by the displaced portion of the donor cut chain is filled by reparative DNA synthesis.

3) The displaced single chain zone of the donor DNA is coated by subunits of the RecA protein (at the rate of one RecA monomer per 5-10 bases). Thus, that simple chain adopts an extended helical configuration.

4) Assimilation or synapse: This is the key moment of action of RecA. Somehow, the DNA-bound RecA c.s. The donor facilitates the encounter of the latter with the complementary double helix part of the recipient, so that in principle a triple helix is formed. Then, with the hydrolysis of ATP, RecA facilitates that the donor chain moves to the homologous chain of the receptor, and therefore matches the complementary one of that receptor. In this process, the chain portion of the donor's homologous receptor is displaced, causing the so-called "D-structure".

It is important to highlight that this process promoted by RecA depends on the donor and the recipient having great sequence homology (from 100 to 95%), and that these homology segments are more than 100 bases in length.

Note that this synapse involves the formation of a portion of heteroduplex in the double receptor helix: there is an area where each chain comes from a DNA c.d. different parental (donor and recipient).

5) It is assumed that the newly displaced chain of the recipient DNA (D-structure) is digested by nucleases.

6) Covalent union of the ends originating in the two homologous chains. This results in a simple cross-linking whereby the two double helices are "tied." The resulting global structure is called the Holliday structure or joint.

7) Migration of the branches: a complex formed by the RuvA and RuvB proteins is attached to the crossing point of the Holliday structure, which with ATP hydrolysis achieve the displacement of the Hollyday crossing point: in this way the portion of heteroduplex in both double helices.

8) Isomerization: to easily visualize it, imagine that we rotate the two segments of one of the DNA c.d. 180o with respect to the cross-linking point, to generate a flat structure that is isomeric from the previous one ("X structure").

9) Resolution of this structure: this step is catalyzed by the RuvC protein, which cuts and splices two of the chains cross-linked at the Hollyday junction. The result of the resolution may vary depending on whether the chains that were not previously involved in the cross-linking are cut and spliced, or that they are again involved in this second cutting and sealing operation:

a) If the cuts and splices affect the DNA chains that were not previously involved in the cross-linking, the result will be two reciprocal recombinant molecules, where each of the 4 chains are recombinant (there has been an exchange of markers between donor and recipient)

b) If the cuts and splices affect the same chains that had already participated in the first cross-linking, the result will consist of two double helices that present only two portions of heteroduplex DNA.

8 0
3 years ago
Which statement describes a characteristic of a spiral galaxy?
artcher [175]

Answer:

If your just looking for a description here you go.

Explanation:

Most spiral galaxies contain a central bulge surrounded by a flat, rotating disk of stars. The bulge in the center is made up of older, dimmer stars, and is thought to contain a supermassive black hole. Approximately two-thirds of spiral galaxies also contain a bar structure through their center, as does the Milky Way.

Hope this helps.

4 0
3 years ago
30 PONITS BEST ANSWER
nexus9112 [7]
Touching a hot pan and yanking your hand away--That is nervous system. Going through puberty is controlled by the pituitary gland. jumping up and down is controlled by the muscular system. Breathing harder during a jog is controlled by the respiratory system. Getting energy to sit through class by eating cereal and a banana is controlled by digestive system and muscular system. hope it helps
6 0
3 years ago
Most doctors and midwives recommend waiting at least ________ after birth to have intercourse.
Likurg_2 [28]

Most doctors and midwives recommend waiting at least four to six weeks after birth to have intercourse.

<span>This time window ensures that the cervix close, postpartum bleeding stop, and any internal injures heal properly so the woman don’t have any risk of hemorrhage or infection.</span>

7 0
3 years ago
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