If a microbiology lab student left the safranin out of the Gram stain procedure, what would be the result?
A. All cells would be purple.
B. Gram-positive cells would be purple and Gram-negative cells would be colorless.
C. All cells would be pink.
D. Gram-positive cells would be pink and Gram-negative cells would be purple.
E. Gram-positive cells would be colorless and Gram-negative cells would be pink.
Answer: B
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Which two are primary complexes for protein synthesis and degradation in eukaryotes?
A. ribosomes and proteasomes B. ribosomes and lysosomes C. proteases and lysosomes D. proteases and proteasomes E. ribosomes and mRNA
Which of the following steps in prokaryotic translation takes place first?
A) aminoacylation of the tRNA molecule B) joining of 30S and 50S ribosomal subunits into 70S ribsomes C) binding of mRNA to a ribosome D) attachment of fMet aminoacyl tRNA E) catalysis by RNA polymerase
How many chromosomes and sister chromatids are shown in the cell indicated by the arrow?
1.one unduplicated chromosome, two chromatids
2.one duplicated chromosome, two chromatids
3.two unduplicated chromosomes, each with one chromatid
4.two duplicated chromosomes, each with two chromatids
Cellular respiration involves all of the following except
A. the breakdown of molecules. B. the release of carbon dioxide. C. the release of energy. D. breathing in and out. E. the synthesis of ATP.