The original source of variation within a population comes from ________
Fill in the blank(s) with correct word
mutations
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Which of the following amino acids is not one of the 20 common amino acids found in cells?
A) leucine B) isoleucine C) glutamine D) proline E) pyrrolysine
Which of the following represents a different principle for food preservation?
A. Heating B. Addition of salt C. Freeze-drying D. Smoking
In Frederick Griffith's experiment, live R cells and dead S cells were injected into mice, causing fatal pneumonia. Neither live R cells nor dead S cells alone cause pneumonia, so Griffith concluded that _____
1.DNA is the genetic material 2.some, but not all, R cells cause pneumonia 3.DNA encoding the ability to form capsules was released from dead S cells and picked up by R cells 4.hereditary information of unknown identity transformed R cells into S cells 5.DNA controls the synthesis of specific products
Which of the following structures is NOT found in prokaryotic cells?
a. Flagellum b. Axial filament c. Cilium d. Pilus e. Peritrichous flagella