Dead and injured white blood cells are removed from circulation by the:
red bone marrow.
Which of the following membranes lines the airways and digestive tract?
When the amount of thyroxine in the body increases, the basal metabolic rate of the body also increases.
Which of the following would result in passive immunity?
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
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.
Which of the following is not considered a potential problem when using retroviruses as gene delivery vectors?
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.
Vasoconstriction and vasodilation of blood vessels are caused by a number of factors including:
closing/opening of precapillary sphincters
all of the above
In some cases, why doesn’t the immune system recognize and destroy a cancer?
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
Which term describes an active, orderly process for eliminating genetically damaged or dead cells without inflammatory reactions?
When a blood pressure is taken by a medical professional, the pressure in the main veins is recorded.
Peer review is essential to the scientific process because
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
Which of the following is an oligosaccharide?
Which of the following is not true regarding arrhythmias?
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.
Hemolytic disease of the newborn could result from which of the following situations?
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
Cyanide is the most acutely toxic substance known.