The chromophore of basic dyes is a ________ and is ________ to MOST types of bacteria.
a) cation; attracted
b) anion; attracted
c) cation; not attracted
d) anion; not attracted
Ans: a) cation; attracted
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When blood sodium levels fall, which hormone promotes sodium retention by the kidney in mammals?
A. cortisol B. aldosterone C. estrogen D. antidiuretic hormone E. testosterone
Transcription factors control which of the following phases of pattern formation in the human embryo?
A. formation of body axes and segmentation B. segmentation and development of segment characteristics C. segmentation, development of segment characteristics, and cell differentiation D. formation of body axes, segmentation, development of segment characteristics, and cell differentiation E. cell differentiation
Enveloped viruses ____
a. generally lyse host cells as they are released b. synthesize envelope lipids as they replicate within the host cell c. acquire their envelope as they bud from the host cell d. acquire their envelope as they enter the host cell e. always contain DNA genomes
The Gram-staining procedure is widely used because it allows rapid identification of a microorganism with little additional testing.
Answer the following statement true (T) or false (F)