Please select the genera that are considered to be irregular gram-positive bacilli.
> Corynebacterium
> Propionibacterium
> Clostridium
> Mycobacterium
> Actinomyces
> Corynebacterium
> Propionibacterium
> Mycobacterium
> Actinomyces
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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.
The hemoglobin molecule ____
a. transports oxygen from the lungs to the cells of the body b. prevents sickle cell anemia when present in high enough concentrations in the blood c. is involved in amino acid metabolism d. acts as a cell surface receptor e. is controlled by a single gene
When blood glucose levels decrease (as between meals), what reserves are tapped first?
a. glycogen b. fats c. proteins d. steroids e. amino acids
Where in the lymph node do the T cells first encounter antigens presented by dendritic cells?
What will be an ideal response?