When the heart’s pacemaker malfunctions ___
can result.
a. artherosclerois
b. sudden cardiac arrest
c. congenital heart defect
d. coronary heart diseases
e. hypertrophic cardiac defect
B
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Your class takes a field trip to a freshwater stream, where you collect the organism shown microscopically here.
(a) What is the genus name of this organism? (b) Identify and give the function of the structure within the chloroplast at the end of the leader (line).
When nitrate is reduced to dinitrogen gas (N2), nitrogen is removed from the ecosystem and returned to the atmosphere through a series of reactions collectively known as ________.
A. denitrification B. nitrogen fixation C. anammox reaction D. All of the choices are correct.
In animals with a brain, the two major divisions of the nervous system are the ____
a. autonomic and peripheral nervous systems b. central and peripheral nervous systems c. brain and spinal cord d. nerves from the brain and the peripheral nervous system e. cranial and spinal nerves
Imagine that you are a detective who has identified a potential suspect in a homicide. You acquire a small amount of blood from the crime scene and hand it over to your lab. The lab carries out PCR for one polymorphism, and it returns as a match to your suspect. Is this enough to arrest your suspect?
A. Yes, these data definitively prove that your suspect was at the crime scene. B. Yes, the chance that your suspect will have the same polymorphism as a drop of blood from a random individual is about 1 in 50,000?this is enough to arrest the suspect. C. No, your lab should assess additional polymorphisms?a single polymorphism does not constitute a genetic fingerprint. D. No, the small amount of blood you acquired from the crime scene will not provide enough genetic material for PCR to be carried out efficiently?more than a single drop of blood is needed to provide enough raw material for analysis.