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3 years ago

What can dried blood tell an expert?

2 answers:

4 0

Blood dries over time. How quickly this happens depends on the surface on which the blood landed, how much blood the spatter contains, and the heat and humidity at the crime scene, but as a rule the outer edges of the stain dry first. Consequently, after the interior portion flakes off or is smeared by an object, a dry blood spatter can skeletonize, that is, leave behind a ring similar in appearance (if not color) to a water ring on a coffee table. Patterns of drying help analysts determine how long an assault went on, detect whether it took place all at once or in stages, and nail down possible crime scene contamination. Clotting patterns in blood provide similar information and can help nail down the time factor if analysts arrive at the scene before blood can dry. Clotting begins within 3 to 15 minutes, but actual times vary by amount, surface type and environment. Mixed levels of clotting can indicate that multiple blows or gunshots occurred over time

attashe74 [19]3 years ago

3 0

Answer:

Making a dry blood test can diagnose hepatitis C

Dry blood samples can detect both antibodies and hepatitis virus RNA successfully. It involves obtaining a few drops of blood by fingerprinting, and letting them dry on a specially specific absorbent paper card.

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When a skeletal muscle contracts, which site undergoes the greatest movement? A. Insertion of the muscle B. Origin of the muscle

amm1812

Its b........................

7 0

3 years ago

Read 2 more answers

Please help its due in a hour!!!!!

garri49 [273]

Answer:

1. The difference between the normal hemoglobin protein DNA sequence and the sickle cell hemoglobin DNA sequence is a base to base shift, in this case adenine (GAG) to thymine (GTG).

2. The difference affects the amino acid sequence of the protein by replacing glutamic acid (Glu) with valine (Val).

Explanation:

In sickle cell anemia, a change in the DNA nucleotide sequence is observed, where adenine is substituted by thymine, whose expression is the change in the amino acid sequence of globine β, incorporating valine instead of glutamic acid. This represents a molecular mutation - point mutation - by subtitution, which corresponds to missense mutation.

Normal hemoglobin protein in a RBC

DNA CTG ACT CCT GAG GAG AAG TCT

Amino acids Leu Thr Pro Glu Glu Lys Ser

Sickle cell hemoglobin protein in a RBC

DNA CTG ACT CCT GTG GAG AAG TCT

Amino acids Leu Thr Pro Val Glu Lys Ser

When GAG is transcribed to mRNA, the CUC codon is obtained, which codes for glutamic acid. Thymine substitution causes the DNA sequence to change to GTG, which is transcribed as CAC, the codon that encodes the amino acid valine. The change from glutamic acid to valine in β-globin causes an altered hemoglobin, giving the abnormal erythrocytes observed in sickle cell disease.

6 0

3 years ago

are narrow-diameter, unmyelinated sensory nerve fibers that transmit signals from pleasant touch. A. P tactile efferents B. C ta

KIM [24]

Answer:

Option E, C tactile (CT) afferent

Explanation:

Whenever a slow moving gentle touch experienced, the response is due to the nerve fibers called C-Tactile afferents (CTs).

C-Tactile afferents (CTs) are unmyelinated mechanoreceptors of low threshold and low conduction velocities.

In humans, CT neurons are found in hairy skin.

The pleasant feeling observed during a slow gentle touch is due to the interaction of

CT neurons project to the insular cortex in the brain

Hence, option E is correct

4 0

3 years ago

5 the main predators of field mice in a certain ecosystem are rattlesnakes and foxes. suppose humans begin building neighborhood

telo118 [61]

The population of the mice would most likely increase. This is because the number of predators of mice will decrease. Predators are those that feed on others, in this case mice. When predators decrease, the prey (which would be the mice) will be able to populate thus leading to an increase in population.

7 0

3 years ago

The difference between the human nervous system and the endocrine system is that

GenaCL600 [577]

Its b or d

Explanation:

None

5 0

3 years ago