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.
