Answer the following statements true (T) or false (F)
1. Both DNA and RNA contain a sugar molecule as part of their structure.
2. Both DNA and RNA have a double helix structure.
3. DNA is the “master code” for making proteins.
4. LDLs have a high concentration of protein and low concentration of lipid.
5. HDL is sometimes called the “bad” cholesterol.
1. TRUE
2. FALSE
3. TRUE
4. FALSE
5. FALSE
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The bicarbonate buffering system is the most important buffering system in the extracellular fluid.
Answer the following statement true (T) or false (F)
A complete spinal cord injury to the upper cervical spine:
A) results in quadriplegia but the patient usually retains his or her ability to breathe spontaneously. B) is not compatible with life and results in immediate death due to cardiopulmonary failure. C) will result in permanent loss of all cord-mediated functions below the level of the injury. D) results in neurologic dysfunction that is considered to be permanent if it lasts longer than 24 hours.
Neurotransmitters
A. cause the production of action potentials in the postsynaptic membrane. B. do not affect membrane channels in the postsynaptic membrane. C. bind irreversibly to the receptor molecules of the postsynaptic membrane. D. remain in the synaptic cleft for long periods of time. E. stimulate presynaptic terminals.
Most common allergies are the result of ________
A) type IV (delayed) hypersensitivity B) type I (acute) hypersensitivity C) type II (antibody-dependent cytotoxic) hypersensitivity D) autoimmune diseases E) type III (immune complex) hypersensitivity