Dead and injured white blood cells are removed from circulation by the

uestion 20

Dead and injured white blood cells are removed from circulation by the:

Answer

red bone marrow.

Question 21

Which of the following membranes lines the airways and digestive tract?

Answer

serous

cutaneous

membranous

synovial

mucous

Question 22

When the amount of thyroxine in the body increases, the basal metabolic rate of the body also increases.

Answer

True

False

Question 23

Which of the following would result in passive immunity?

Answer

vaccination

past occurrence of an infection or disease

production of memory cells

movement of antibodies across the placenta from mother to child

stimulation of T cells and B cells by an antigen

Question 24

Restriction enzymes are used in genetic engineering to cut DNA between specific base pairs in a DNA strand, resulting in DNA segments that are then used for further study and analysis.

Answer

True

False

Question 25

Which of the following is not considered a potential problem when using retroviruses as gene delivery vectors?

Answer

Retroviruses splice their own RNA-based genetic code permanently into the DNA of the cells they infect.

Retroviruses generally insert foreign DNA into a cell only when the cell is dividing.

Retroviruses insert their genetic material randomly in the genome.

Retroviruses must be rendered harmless before being used.

Question 26

Vasoconstriction and vasodilation of blood vessels are caused by a number of factors including:

Answer

emotions

closing/opening of precapillary sphincters

hormones

nervous stimulation

all of the above

Question 27

In some cases, why doesn’t the immune system recognize and destroy a cancer?

Answer

Cancer cells that produce abnormal antigens sometimes shed them.

Cancer cells have less surface receptors needed for proper activation of T cells.

Cancer cells have enough “self” surface markers as to be identified as normal cells.

Cancer cells develop from normal cells that cannot regulate cell division.

all of the above

Question 28

Which term describes an active, orderly process for eliminating genetically damaged or dead cells without inflammatory reactions?

Answer

Necrosis

Apoptosis

Mitosis

Fibrosis

Question 29

When a blood pressure is taken by a medical professional, the pressure in the main veins is recorded.

Answer

True

False

Question 30

Peer review is essential to the scientific process because

Answer

It ensures that the findings from experimentation are scrutinized for accuracy

it is the primary means for informing other scientists of new information in the field

the process can lead to improvements in articles prior to being published

the process immediately validates any hypothesis tested in the experiments

both A and C

Question 31

Which of the following is an oligosaccharide?

Answer

glucose

DNA

maltose

starch

ribose

Question 32

Which of the following is not true regarding arrhythmias?

Answer

One type, known as ventricular fibrillation, is the leading cause of cardiac death in people who are otherwise in good health.

An artificial pacemaker can sometimes be used to correct this condition.

All forms of arrhythmias are considered serious medical conditions.

Arrhythmias can occur when heart muscle becomes damaged.

An ECG can be used to diagnose this condition.

Question 33

Hemolytic disease of the newborn could result from which of the following situations?

Answer

mom is Rh+; fetus is Rh-

mom is Rh-; fetus is Rh+

mom is Rh+; fetus is Rh+

mom is Rh-; fetus is Rh-

either C or D

Question 34

Cyanide is the most acutely toxic substance known.

 

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