1.1.1-1.1.4 Biomedical science

Some individuals have low blood

oxygen levels because of the abnormal shape of which blood component?

Red Blood Cells

How can blood at a crime scene be analyzed?

Patterns of spatter are measured and provide clues to the event that occurred

Size of blood droplets can indicate the height from which they fell

Blood type can be determined and compared to persons of interest

Jane Doe wants to know her blood type. Her blood agglutinated with the Anti-A serum (+), but did not agglutinate with the Anti-B serum (-).

What is Jane Doe's blood type?

A

You fall down and scrape your knee. Which component of blood would work to clot the blood at the injury site to generate a scab?

Thrombocytes

Which of the following blood types have both A and B antigens?

AB

Which component of blood carries essential components to where they are needed in the body?

Plasma

Jill has a bacterial infection. In her blood test, which component of blood would have higher numbers than normal?

Leukocytes

What is the initial blood test that suggests a red-stained sample from a crime scene might be blood?

Presumptive Testing

Which 2nd blood test confirms that it is blood because only blood will react with the chemicals used?

Confirmatory Testing

What shape of blood stain is produced when a droplet of blood strikes a horizontal surface at 90 degrees?

Circle

True or False

Identical twins have the same fingerprints

False

If you are looking through a microscope's Eyepiece, and you are currently using the High Power Objective, what is the total magnification?

400x

How many minutiae must be matched to establish an identical fingerprint?

12-15

Label the following Fingerprint ridge pattern.

Whorl

Which of the following is the medulla, which technicians may look at to measure its relative width, see if it is continuous or fragmented, or opaque or translucent?

C

Label the following Fingerprint ridge pattern

Loop

If you are looking through a microscope's Eyepiece, and you are currently using the Low Power Objective, what is the total magnification?

100x

Which of the following is NOT a vital piece of evidence that might be obtained at a crime scene?

Polygraph Test

Identify the ridge pattern for the following partial print found on Ms. Sarnese's doorknob

Arch

What was the dependent variable in our Polygraph Test experiment?

Physiological responses

Why is it important to establish baselines during a polygraph test?

This data serves as the control on how the subject responds physiologically when telling the truth.

______ is the number of cardiac beats per minute while ______ is the number of breaths per minute

Heart rate...Respiration rate

Which 2 physiological responses did we collect and analyze with polygraph tests?

Respiration Rate and Heart Rate

In an experiment, which variable is measured and whose value is influenced by another variable?

Dependent variable

If a polygraph test shows that a person's heart rate and respiration rate has increased compared to their baseline, this person might be _______________.

lying

An investigator is searching a crime scene in a house by assigning each room to a different search team. Which search method is being used?

Zone method

Which of the following is NOT a common characteristic of the biomedical science mindset?

Working alone in isolation

An investigator is searching a large, open field for evidence. Which search method would be the most effective and practical?

Line (strip) method

According to the activity , which of the following elements is NOT a requirement to be included in a crime scene sketch? 

The cause of death

What is the main purpose of establishing a "point of origin" when documenting a crime scene?

To create a fixed point from which to take all measurements consistently.

In forensic investigations, what is the term used to refer to a person who has died?

Decedent

Label the 3 parts of a nucleotide below, X, Y, and Z

X = Phosphate group

Y = 5-carbon sugar “Deoxyribose”

Z = Nitrogenous base

Adenine and Guanine are purines. Cytosine and Thymine are pyrimidines. What is the difference between purines and pyrimidines?

Pyrimidines —> 1 ring

Purines —> 2 rings

Adenine always pairs with ___

Cytosine always pairs with ____

Guanine always pairs with ____

Thymine always pairs with ____

A pairs with T

C pairs with G

G pairs with C

T pairs with A

make a cut when u see

GG|CC

CC|GG

DNA pieces can be separated and compared using a process called

gel electrophoresis