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WorksheetsForensics Midterm Review
Total questions: 65
Worksheet time: 33mins
A forensic scientist is responsible for providing __________ in a court of law.
Opinion
Fact
Judgement
Reflection
What is the best mental state for observing?
Nervous
Happy
Relaxed
Excited
According to the Innocence Project, most faulty convictions are based on ___________.
poor equipment
poor DNA
inaccurate eyewitness accounts
poor search techniques
Which is NOT a way to improve observational skills?
Look over the entire area.
Observe everything, big or small.
Record only the things you know are important.
Write down and photograph everything.
Which is NOT a responsibility of a forensic scientist?
Search a crime scene.
Be the first responder.
Give evidence in court.
Question a suspect.
Locard's exchange principle implies all of the following except...
fibers can be transferred from one person to another.
blood spatter can be used to identify blood type.
cat hair can be transferred to your pants.
soil samples can be carried from your yard into your home.
Which would NOT be an example of trace evidence?
A victim's own blood gushing from a wound.
Hair left on a hair brush.
A victim's blood left on a suspect.
A footprint left in the mud.
Why is it important to separate witnesses at a crime scene?
To prevent contamination of evidence.
To keep them from fighting.
To keep them from talking to each other.
To protect them from the perpetrator.
Which is needed for correct evidence collection?
Document location of all evidence.
Correctly package all evidence.
Maintain the proper chain of custody.
All of these.
Which should NOT be included in a crime scene sketch?
A north heading.
Date and location.
A scale.
Type of search pattern used.
The word "forensic" refers to the application of scientific knowledge to legal questions.
True
False
Investigators do not need to be trained to have good observation skills.
True
False
If we remember seeing something, we can trust that it happened just as we think it did.
True
False
Most wrongful convictions are the result of faulty eyewitness testimony.
True
False
The Innocence Project seeks to get wrongfully convicted killers out of prison.
True
False
Natural fibers can be harvested from __________.
plants and animals
plants only
animals only
plants, animals, and minerals
Why is silk shiny?
It can refract light.
It has smooth, round fibers.
It has a hollow core.
It has mucus secretions from the silkworm.
Why is cotton a great source of fiber for clothing?
It's easy to grow.
It's resistant to staining.
The fibers are easily woven and dyed.
The fibers are extremely long.
Which is typically not made from mineral fibers?
Shingles
Rope
Break liners
Floor tiles
Which is NOT a characteristic of synthetic fibers?
They are made from combining monomers into polymers.
They are man-made.
They are used in the production of carpet fibers.
They do not contain any natural fibers.
Which is a characteristic of natural fibers?
They are stronger than synthetic fibers.
They will not break down under bright light.
They melt at lower temperatures than synthetic fibers.
They are affected by microscopic organisms.
Which observation can be used to identify a specific fiber?
Smell of the burned fiber.
Coiling or melting of the fiber when burned.
Color and texture of fiber residue after burning.
All of these.
Why are fibers such a good source of trace evidence?
They are easily transferred.
They are often overlooked by a suspect.
They are easily collected and stored.
All of these.
What two traits would indicate that a fiber was a human hair and not a clothing fiber?
Presence of a cuticle.
Medullary index of 0.33 or less.
A wide diameter.
Ability to dissolve in water.
The parts of the hair shaft are the cuticle, cortex, and ________.
root
crown
granules
medulla
Which are needed to calculate the medullary index of a hair?
Width of medulla, width of hair shaft
Length of hair, pattern of pigmentation
Width of cortex, width of medulla
Scale diameter of cuticle, length of hair
Which characteristic is typical of Asian hair?
dark medulla
curly hair
pigment sparsely distributed
flattened cross section
Human hair has which type of cuticle?
Imbricate
Coronal
Pigmented
Spinous
Neutron activation analysis can check hair for the presence of _______.
silver
DNA
water content
hair dye
Which part of the hair can be analyzed for DNA?
Medulla
Follicle
Cortex
Cuticle
Hair cuticle scales always point toward...
the root of the hair
the tip of the hair
the medulla
the follicle
Which stage is the time of active hair growth?
Catagen
Telogen
Anagen
Imagen
Which best describes northern European hair?
Straight; evenly distributed granules
Coarse; thick cuticle; continuous medulla
Kinky; dense, unevenly distributed pigments
Round cross section; large diameter
Which would most likely be a result of hair bleaching?
Higher number of disulfide bonds
Yellowish tint to hair
More triangular cross section
Thickened cuticle scales
A hair shaft is class evidence.
True
False
Hair is made of a protein called cellulose.
True
False
All hairs on a person's head are identical.
True
False
The cortex of a hair may contain pigment granules.
True
False
When are fingerprints formed?
Shortly after birth
10 weeks gestation
2 years of age
17 weeks of pregnancy
Actual fingerprint indentations left in a soft material.
plastic prints
patent prints
indented prints
latent prints
Why is fingerprint identification imperfect?
Humans can make mistakes during analysis.
Multiple people can have the same exact fingerprints.
People can easily change their fingerprints.
All of these.
The three main fingerprints patterns.
Loops, whorls, deltas
Loops, whorls, arches
Arches, cores, deltas
Whorls, bifurcations, arches
A small triangular region of a fingerprint.
Delta
Eye
Spur
Bridge
Fingerprints are a result of oils from your skin mixing with dirt.
True
False
Fingerprints are class evidence.
True
False
Investigators must find a full print from a suspect in order to match a print found at a crime scene.
True
False
Plastic prints must be dusted or treated to identify ridge patterns.
True
False
Loops are the most common fingerprint pattern.
True
False
Fingerprints are formed deep within the dermis of the skin.
True
False
With the help of IAFIS, it is possible to obtain a fingerprint match within a few hours.
True
False
An alternate form of a gene.
DNA fingerprint
DNA probe
chromosome
allele
Which cell structure contains genetic information along a strand of DNA?
allele
chromosome
DNA probe
DNA fingerprint
A method of separating molecules, such as DNA, according to their size using an electric current passed through a gel containing the samples.
PCR
Gene
Gel electrophoresis
Restriction enzyme
Blood type is determined by the presence of proteins located on...
all blood cells.
white blood cells only.
T helper cells.
red blood cells only.
Blood proteins that determine blood types are...
on the surface of the cell membrane.
inside the cytoplasm.
on the cell membrane and in the cytoplasm.
in the bone marrow.
A person with A- blood has...
A protein only.
O protein but not Rh protein.
none of the ABO or Rh proteins.
the Rh protein but not A or B proteins.
What is the function of red blood cells?
Help with clotting.
Fight infection.
Carry oxygen.
Carry hormones.
What is the function of platelets?
Help with clotting.
Fight infection.
Carry oxygen.
Carry hormones.
Which is the universal receiver?
A
AB
B
O
Which is the universal donor?
A
AB
B
O
A gunshot wound close to the head would produce...
low velocity spatter.
medium velocity spatter.
high velocity spatter.
none of these
Which part of the blood is responsible for fighting infections?
Red blood cells.
White blood cells.
Platelets
Plasma
A drug or other chemical compound whose manufacture, distribution, possession, and use is regulated by the legal system.
toxicity
controlled substance
drug
toxin
A naturally occurring or manufactured substance that can cause severe harm or death if ingested, inhaled, or absorbed through the skin.
toxicity
controlled substance
narcotic
poison
A poisonous substance naturally produced by certain plants, animals, and bacteria that is capable of causing disease or death in humans.
toxicity
controlled substance
drug
toxin
