Scarlet fever is a clinical manifestation of streptococcus pyogenes infection. The skin rash is caused by
A. Erythrogenic toxin
B. Streptolysin S
C. Streptolysin O
D. Streptokinase
E. Exfoliative toxin A-G
Ans: A. Erythrogenic toxin
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The presence of an antibiotic in the media where the bacteria are grown enables the selection of colonies grown from
(a) transformed cells. (b) nontransformed cells. (c) cells that have the gene for resistance to the antibiotic. (d) both a and c.
Recall that Archaea has three main groups. Which of the following is not one of the major archaeon groups?
A. Thaumarchaeota B. Crenarchaeota C. Euryarchaeota D. Firmicutes
What is the correct order of gene expression in the early Drosophila embryo?
A. gap genes, pair-rule genes, segment polarity genes B. gap genes, segment polarity genes, pair-rule genes C. pair-rule genes, gap genes, segment polarity genes D. segment polarity genes, pair-rule genes, gap genes
Molecules
A. are derived from the ionic bonding of two or more atoms. B. are not important in biological processes. C. have the same physical properties as the atoms from which they were derived. D. cannot have a charge. E. can form from the covalent bonding of two or more atoms.