Lipopolysaccharide is an important cell envelope component of ________.
A. gram-positive bacteria
B. gram-negative bacteria
C. mycoplasmas
D. acid-fast bacteria
E. protoplasts
Answer: B
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Prokaryotes consist of ________.
A. organisms belonging all to the same domain, bacteria B. organisms belonging to three different domains, bacteria, archaea, and protists C. organisms belonging to eukaryotes D. organisms belonging to two different domains, bacteria and archaea
A scientist wants to study histones. Histones are:
A. proteins that double-stranded DNA molecules wrap around in eukaryotes. B. proteins that double-stranded DNA molecules wrap around in prokaryotes and eukaryotes. C. proteins that regulate checkpoints in the mitotic cell cycle. D. proteins that serve as the spindle fiber to pull sister chromatids apart during anaphase. E. proteins that required for the activity of Cdk enzymes.
Which of the following structures is not matched properly with its function?
A. collecting ducts: selective reabsorption of key electrolytes and solutes B. glomerulus: filtration C. renal tubules: secretion of additional wastes D. ureter: transport of urine to the bladder E. bladder: storage and elimination of urine
During a biochemical reaction, (C3, H4, O3) is converted into carbon dioxide (CO2)and water(H20)In what cellular organelle does this biochemical reaction occur?
A nucleus B cytoplasm C mitochondria D endoplasmic reticulum