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Bond [772]
4 years ago
15

1. Why is it difficult to evaluate thresholds for toxic pollutants? a. Synergistic effects are difficult to account for. b. Ther

e is not enough research on the consequences of multiple exposures. c. Lack of knowledge on the effect of possible interactions of mutiple toxins. d. All of the above
Biology
1 answer:
qaws [65]4 years ago
7 0
The options are all related, and the answer is D) All of the Above. 

The synergistic effects of exposure to multiple toxins are more difficult to quantify and study. As a result, there is not sufficient research on how much a system can take when exposed to multiple pollutants. This lack of research also means that we often do not even know what the effect of these interactions between multiple toxins are.

As a result of these gaps in our knowledge of the interactions between toxins, it is difficult to evaluate the threshold for pollutants, since a system will rarely feature only one pollutant in isolation. 
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For a substrate to bind to a particular enzyme what do you need
sattari [20]

The enzyme’s active site binds to the substrate. Since enzymes are proteins, this site is composed of a unique combination of amino acid residues (side chains or R groups). Each amino acid residue can be large or small; weakly acidic or basic; hydrophilic or hydrophobic; and positively-charged, negatively-charged, or neutral. The positions, sequences, structures, and properties of these residues create a very specific chemical environment within the active site. A specific chemical substrate matches this site like a jigsaw puzzle piece and makes the enzyme specific to its substrate.
4 0
4 years ago
A series of two point crosses is carried out between genes for brown eyes (bw), and arc wings (a), vestigial wings (vg) , ebony
AlekseyPX

Answer:

Order of genes: Vg---cv--a---bw---e

Distances among linked genes:

  • a/bw distance is 4.99 MU
  • bw/cv distance is 26.99 MU
  • a/cv distance is 23.98.
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  • bw/vg distance is 33.9 MU
  • cv/vg distance is 12.62 MU

Gene e assorts independently. Its location is symbolical, meaning that it might be in the same chromosome but far away from the rest of the genes,  or it might be located in another chromosome.

Explanation:  

Due to technical problems, you will find the complete answer in the attached file

Download pdf
7 0
3 years ago
Explain why the hypothalamus can be compared to a thermostat.
nikklg [1K]

Answer:

Because it plays a major role in regulating body temperature.

Explanation:

The hypothalamus is the heating regulating center of our body which is placed in the hypothalamus. It plays a major role in regulating body temperature, acts as a thermostat and also helps to maintain homeostasis in lots of different ways, for example, by controlling our blood pressure.

When our body cools below the normal temperature it helps to switch up the heat-generating processes and when the body gets overheated it helps to switch off the heat-generating processes.

7 0
4 years ago
A relationship in which one species benefits while the other species is harmed is known as _____
marshall27 [118]

Answer:

It is known as a parasitic relationship.

Explanation:

Parasitic relationships are exactly what you described. We see these sorts of relationships in nature in worms for instance.

When a worm attaches to a host, it oftentimes leeches off the host's blood for nutrients and the like. In this manner, the worm benefits while the host gets weaker and loses nutrition.

Other examples include ticks and leeches.

3 0
3 years ago
The nucleus:
oksano4ka [1.4K]

Answer:

The nucleus stores DNA.

3 0
3 years ago
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