Fraternal twins
A. have exact copies of each other's DNA.
B. are usually of opposite sex.
C. are only as alike as any other siblings.
D. will usually occur at the first pregnancy.
C. are only as alike as any other siblings.
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Penicillin is a competitive inhibitor produced by a fungus in order to kill invading bacteria. It does this by mimicking the substrate required by the bacterium to build and repair its cell wall. Describe how mimicking the substrate would result in the death of the bacterium.
What will be an ideal response?
Some present-day bacteria use a system of anaerobic respiration characterized by an electron transport chain analogous to that found in aerobic organisms. Which of the following correctly characterizes the anaerobic electron transport chain?
A. It uses oxygen as a final electron acceptor. B. It is embedded in the outer mitochondrial membrane rather than the inner mitochondrial membrane. C. It establishes a proton gradient between the cytoplasm and the extracellular fluid. D. It establishes a proton gradient between the intermembrane space and the cytoplasm. E. None of these answer options accurately characterizes the anaerobic electron transport chain.
Which of the following is not a basic need of the cell?
A) molecular building blocks B) 100% efficiency C) energy D) information E) chemical catalysts
More than half of the body's blood platelets are made by megakaryocytes in the