Penicillin would be most effective against
A. non-growing bacteria.
B. growing bacteria.
C. Gram-positive bacteria.
D. Gram-negative bacteria.
E. growing bacteria AND Gram-positive bacteria.
E
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Chemoheterotrophic bacteria are primary producers
Indicate whether the statement is true or false.
The act of nursing stimulates the contraction of smooth muscle cells in the breast. If a newborn infant is unable to nurse, then
A. progesterone secretion is not inhibited. B. milk is not produced. C. oxytocin is not secreted. D. prolactin is not secreted. E. prostaglandins are not secreted.
A population with five males and five females is an example of
A. age distribution. B. gene flow. C. sex ratio. D. reproductive capacity.
Irregular dental hygiene and a high sugar diet may led to tooth decay. Why?
A. Bacteria consume calcium. B. Glucose forms a weak acid when dissolved in saliva. C. High concentrations of sugar soften the tooth enamel. D. Lactic acid fermentation is used to generate ATP under anaerobic conditions. E. Plaque degrades the tooth's protective mucosal layers.