Circular DNA molecules found in nature (such as bacterial, viral, or mitochondrial DNA) are
A) positively supercoiled.
B) negatively supercoiled.
C) not supercoiled, due to their small size.
D) always oriented in a triple helix to conserve space.
E) always in the relaxed state.
B) negatively supercoiled.
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Answer the following statements true (T) or false (F)
1. CSF specimens should be refrigerated en route to the Clinical Microbiology Laboratory. 2. There is no need to refrigerate urine specimens for culture if they are clean-catch midstream specimens. 3. Many clinical specimens labeled “sputum” are actually saliva specimens. 4. The Clinical Microbiology Laboratory is part of the Clinical Pathology Division of the Pathology Department. 5. ?-Lactamase testing is always performed on isolates of Neisseria gonorrhoeae and Haemophilus influenzae.
The neuromuscular junction is incorrectly described in which of the following statements?
A) Neurotransmitters are stored in vesicles in the axon terminal. B) The sarcolemma is the plasma membrane of a muscle cell. C) Acetylcholine binds receptors in the synaptic cleft. D) T tubules carry action potentials into the muscle cell. E) Acetylcholine binding allows sodium ions to enter the muscle cell.
In lineages that moved onto land, gills were replaced by lungs; kidneys became better at conserving
__________, and the circulatory system became more efficient. Fill in the blank(s) with the appropriate word(s).
following amino acid would be characterized as __________ based on the chemical properties of
its side chain.
a. nonpolar
b. acidic
c. basic
d. hydrophilic
e. electrically charged