1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Naddika [18.5K]
2 years ago
7

Upon examining a crime scene you don't locate any visible prints. To identify latent prints you will have to use a powder. There

is evidence to suggest that the suspect exited the crime scene through a door, the door frame is dark brown and the surrounding wall is dark green. What powder should you use
A) magnetic
B) titanium
C) aluminum
D) fluorescent

A forensic investigation involves the determination of manner, cause and mechanism of death. Select the choice that represents an example of cause of death.
A) homicide
B) asphyxia
C) skull fracture
D) epidural hematoma

What two drug isolation techniques are used together to give a very specific identification on a molecular level.
A) Scott test and gas chromatography
B) gas chromatography and mass spectrometry
C) thin layer chromatography and Infrared spectrometry
D) Marquis test and HPLC (high pressure liquid chromatography)
Biology
2 answers:
stepan [7]2 years ago
8 0

Answer: First answer is D- Fluorescent.

Second Answer is B- Asphyxia

Third answer is C- Thin layer chromatography and Infra Spectrometry.

Explanation:

Fluorescent powders for forensic use are developed to be used with a variety of light sources especially ultraviolet lights and are used to extract latent prints from dark surfaces and multicoloured surfaces where the prints and the surfaces and indistinguishable. They are also good for extracting latent prints from wooden surfaces. When applied, the hues of the fluorescent powder can be matched to the colour of the surfaces and the wavelength of the light source will be used. This way, it eliminates any background interference that may occur from the surface colour during extraction of latent print.

In forensic investigation, a cause of death means the injury or disease that lead to death. Asphyxiation is a condition where the body experiences insufficient supply of oxygen to continue its normal function. Common causes of asphyxia are choking, suffocation, drowning and strangulation. In general, for asphyxiation to occur, something physical is blocking the airways or lungs from receiving sufficient oxygen.

Thin layer chromatography is an economical and efficient technique used in separating mixtures of solids and liquids that are non-volatile in nature. It is used to separate compounds in a mixture. Infra red spectrometry is the interaction of infrared radiation with matter. It is used to study chemical substances of solid, liquid and gas. Thin layer chromatography and infra red spectrometry are good complements which are useful in analytical and research laboratories for analyzing molecules and different compounds especially for diverse complex researches.

shusha [124]2 years ago
5 0
<span>1. The investigator should use fluorescent fingerprint powder, so that the prints will be visible on the dark surface when a special kind of light is used. 

2. A possible cause of death would be asphyxia, and is one of the most common causes of death that involve murder and violence. 

3. C. thin layer chromatography and Infrared spectrometry 

</span>
You might be interested in
I really need help in biology please
Morgarella [4.7K]

Answer:

What is the genotype for a h0m0zygous dominant plant? PP

What is the phenotype? Purple plants

What is the genotype for a h0m0zygous recessive plant? pp

What is the phenotype? White plants

What is the genotype for a heterozygous plant? Pp

What is the phenotype? Purple plants.

What is the genotype for a h0m0zygous dominant for freckles? FF

What is the phenotype? Freckles

What is the genotype for a h0m0zygous recessive for freckles? ff

What is the phenotype? No freckles

What is the genotype for a heterozygous individual for freckles? Ff

What is the phenotype? Freckles.

Each individual has two alleles for a given gene.

For example, the allele dimples are dominant. How would you represent this allele? With capital letters, for example, DD.

The allele for no dimple is recessive. How would you represent this allele? With lowercase letters, for example, dd.

The allele for brown eyes is dominant. How would you represent this allele? With capital letters, for example, BB.

The allele for blue eyes is recessive. How would you represent this allele? With lowercase letters, for example, bb.

PP: h0m0zygous dominant; Yy: heterozygous; Ss: heterozygous; bb:h0m0zygous recessive; FF: h0m0zygous dominant

Explanation:

Every being, such as plants, animals, or humans, have two different copies of a gene. These are alleles. These copies can be dominant or recessive.

Dominant genes are the ones that we will see. They "hide" the recessive gene. Recessive genes are the ones that we will only express if the two alleles are recessive since there is no dominant gene that hides the other.

Genotype is the genes that an individual or animal has. We can not see it. For example, a person can have a dominant trait for blue eyes and a recessive trait for brown eyes (Bb)s. In other words, it is the genetic information that a person carries. The phenotype is what we can see of a trait. Following the previous example, the dominant trait is blue eyes, and the recessive is brown, so the gene that will express itself is blue eyes, and we will able to see it.

The pair of alleles can be h0m0zygous and heterozygous. H0m0zygous is when the two traits are the same, for example, BB or bb. Heterozygous is when the traits are different, like, Bb.

Pea plants have two flower varieties where purple is dominant over white. The dominant trait, we represent it with a capital letter, in this case, P, because it is the first letter in purple. The recessive trait we represent it with a lowercase letter, in this case, p.

The genotype for a h0m0zygous dominant plant would be PP. We have to remember that the genotype is the information that the plant carries. If this information is h0m0zygous, it means the two alleles are the same, and if they are both dominant, we write capital letters. The phenotype is what we can see of the information; the gene that it is expressed, in this case, would be the color purple.

A h0m0zygous recessive plant has two alleles with the same information, and as they are recessive, we write two lowercase letters (pp). The genotype would be white plants since there is no dominant allele that covers the recessive one.

In a heterozygous plant, the traits are different. We have the dominant trait purple (P) and the recessive trait white (p). The dominant is the one that will express itself and the one that we will be able to see, see in a purple plant.

The following questions are similar to the first one. We know that freckles are a dominant trait, so we use a capital letter to represent it (F) and a lowercase letter to portrait the recessive trait, which is no freckles (f).

A h0m0zygous dominant means that the two alleles are the same and that one does not hide the other so, the genotype would be FF, and the phenotype would be a person with freckles.

If the person is h0m0zygous recessive, it means that it has the same traits, but one allele does not hide the other. The genotype would be ff, and the phenotype would be no freckles.

In the last case, the person is heterozygous, which means that it has one dominant and one recessive allele. The dominant allele will express itself; the genotype would be Ff, and the phenotype freckles.

In the following questions, we know that we represent dominant alleles with capital letters and recessive ones with lowercase letters, if it is a dominant allele for brown eyes, we write BB, taking the first letter of the dominant trait, in this case, brown. If it is a recessive trait, we write lowercase letters, in this case, bb for blue eyes.

In the last set of questions, we have to observe the letters to find the genotype.

PP, FF: the two letters are the same, which means that the allele is h0m0zygous. Also, they are both in capital letters, so they are dominant traits. Yy, Ss: the two letters are different, one is in capital letters, and the other is not. The allele is heterozygous. bb: the two letters are the same, so they carry the same information. They are h0m0zygous. Both of them are in lowercase, so they are recessive alleles.

5 0
3 years ago
If you need help friend me 4th-7th grade
marin [14]

Answer:

okay

Explanation:

just want your help

5 0
3 years ago
The continental crust is:
Pani-rosa [81]

Answer:

the outermost layer of Earth's lithosphere

Explanation:

the outermost layer of Earth's lithosphere that makes up the planet's continents and continental shelves and is formed near subduction zones at plate boundaries between continental and oceanic tectonic plates. The continental crust forms nearly all of Earth's land surface.

5 0
1 year ago
The most abundant minerals found in granitic (felsic) igneous rocks include
mixer [17]
The most common felsic rock is granite. Common felsic minerals include quartz,muscovite<span>, </span>orthoclase<span>, and the </span>sodium<span>-rich </span>plagioclase feldspars<span>. In terms of chemistry, felsic minerals and rocks are at the other end of the elemental spectrum from the mafic minerals and rocks.</span>
7 0
2 years ago
Which is a basic characteristic of all living cells?
dolphi86 [110]

Answer:

Energy Metabolism

Explanation:

In order to a living cell you need to be able to reproduce, have energy metabolism, etc.

5 0
3 years ago
Read 2 more answers
Other questions:
  • What word or two-word phrase best describes the shape of the phosphorus tribromide ( pbr3 ) molecule?
    12·1 answer
  • Eggs and sperm are examples of _____?
    13·1 answer
  • A bird species known as the cattle egret is often found near farms in wet areas. The bird waits, sometimes even perched on a cow
    7·2 answers
  • Although the percentage of teens smoking has gone done in recent years,
    5·2 answers
  • How do the functions of the skeletal and muscular system differ? A. Muscles provide structure and support to the body, while bon
    10·1 answer
  • Which organism is an example of a producer?<br> moth<br> mushroom<br> rose bush<br> cheetah
    5·2 answers
  • If the activation energy required for a chemical reaction were reduced, what would happen to the rate of the reaction? The rate
    10·1 answer
  • PLEASE PLEASE PLEASE HELP ME WITH THIS!! ONCE I FIGURE OUT HOW I'LL MARK BRAINLIEST (or however you spell it)!!
    14·1 answer
  • What method would be the best choice for a climatologist to find out what the ocean temperatures were like during the Pleistocen
    8·1 answer
  • Population X and Y live in the same area. The size of population X increases over time. As a direct result, the size of populati
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!