The genus of pathogenic cocci responsible for a wide range of human disease and whose members grow in chains is (Staphylococcus/Streptococcus/Enterococcus)
What will be an ideal response?
Streptococcus
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Studies have shown that in the flowering plant Arabidopsis the development of parts of a flower is governed by ____
a. differential uptake of hormone signals from the leaves b. the oxygen gradient from outside to inside of the closed flower c. differentiation of cell types as they are formed from the apical meristem d. the timing of cell division e. the expression patterns of several floral organ homeotic genes
The first embryonic blood cells come from
a. the amnion. b. the inner cell mass of the blastocyst. c. the yolk sac. d. the chorion. e. the placenta
When light excites chlorophyll, the chlorophyll
molecules
a. change to carotene. b. become agitated and move rapidly. c. become radioactive. d. electrons jump to a higher energy level. e. become ionized
Attenuation of the trp operon fails to occur when
A) a lack of tryptophan causes stalling of ribosomes on the leader sequence of the RNA. B) an RNA stem-loop forms that allows transcription to continue. C) an RNA stem-loop that causes transcription to terminate fails to form. D) the cell has enough tryptophan. E) the operator is mutated.