Why are the renal artery and vein critical to the process of osmoregulation in vertebrates?
A) The kidneys require constant and abnormally high oxygen supply to function.
B) The renal artery delivers blood with nitrogenous waste to the kidney and the renal vein brings blood with less nitrogenous wastes away from the kidneys.
C) The kidneys require higher than normal levels of hormones.
D) The renal artery and vein are the main pathways regulating how much is produced by the kidneys.
B
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Answer the following statement(s) true (T) or false (F)
1. RNA was probably the first molecule used to encode genetic information; the use of DNA came later. This is due to RNA's inherent stability and its ability to store information more accurately than DNA. 2. Viruses are self-replicating but the replication is much faster in a host cell. 3. Retroviruses are unique because they are a combination of RNA and DNA. 4. Nucleotide analogs are a class of drugs that are highly effective against many types of viruses. They work by halting the replication of viral genes. They are equally effective at stopping the spread of prion diseases. 5. Tetracycline is effective against viruses because it disrupts the action of the viral ribosomes.
Recently discovered fossils reveal that many dinosaurian ancestors of birds had ____
a. boneless tails b. toothless mouths c. enlarged forelimbs d. wings e. feathers
If a physician hears abnormal heart sounds while examining a patient with a stethoscope, this would most likely indicate a problem with
a. the firing of the sinoatrial node. b. the contraction of the heart muscle. c. the function of the heart valves. d. the electrical signal from the muscles of the ventricles. e. the flow of blood into the atria.
Cardiac muscle differs from skeletal muscle in that
A) all cardiac muscle is under involuntary control. B) cardiac muscle is capable of relaxation. C) cardiac muscle contracts in response to an electrical or chemical signal. D) cardiac muscle is excitable and can shorten. E) cardiac muscle gets longer rather than shorter when excited.