Science Quiz

In a controlled experiment, a scientist is studying how long it takes parachutes of different sizes to fall to the ground. What is the independent variable?

• The time it takes for the parachute to drop

• The height from which the parachute is dropped

• The size of the parachute

• The size of the object carried by the parachute

Match the appropriate cell name with its description below the list.

• A. erythrocyte (red blood cell)

• B. leukocyte (provides major defense for our bodies against invading bacteria and viruses)

• D. plasma (Relatively clear liquid medium which carries the other cells)

• C. thrombocyte (contains hemoglobin for carrying oxygen, responsible for clotting)

If a person’s blood is exposed to anti-A serum and it clumps, but does not clump when exposed to anti-B serum, then the blood is:

• A

• B

• AB

• O

Which of the following statements is true regarding the ABO blood system?

• people who have the A antigen normally would not produce the anti-A antibody

• people who are type AB normally produce both anti-A and anti-B antibodies

• the only ABO blood type that normally does not have either A or B antigens is AB

• people who have the B antigen normally would not produce the anti-A antibody

Match the appropriate blood type with the description below the list:

• Type A

• Type B

• Type O

• Type AB

What property of DNA causes it to migrate (travel) to the positive pole of the electrophoresis apparatus?

• the positive charge of the DNA

• the negative charge of the DNA

• the sugars found in the DNA

• the nitrogenous bases found in the DNA

Chromosomes...

• are made up of DNA

• contain genes

• are found in the nuclei of cells

• all of the above.

Which of the following organ systems is not correctly paired with its structural organs and functions?

• Digestive system: Structure—stomach and intestine; Function—digest food into nutrients for energy use.

• Nervous system: Structure—hair and nails; Function—protect tissue.

• Cardiovascular system: Structure—heart and capillaries; Function—transport oxygen and nutrients.

• Respiratory system: Structure—trachea and lungs; Function: gas exchange for cellular respiration.

Which statement(s) incorrectly describe gel electrophoresis? (Pick all incorrect statements)

• PCR is used to amplify gene regions of DNA.

• Restriction enzymes are used to cut DNA into fragments.

• DNA is negatively charged because of the large phosphate groups.

• DNA fragment IV is shorter than DNA fragment I in the figure to the right.

• The crime scene DNA sample matches Suspect 2.

If a cadaver is found at 10:42 pm and has a rectal temperature of 91.6 F, what time did the victim die? Use the following formula to calculate Time of Death: Hours since death = (98.4°F - internal body temperature) / 1.5

• 9:42 pm

• 6:11 pm

• 7:11 pm

• 8:12 pm