The original source of variation within a population comes from ________

Fill in the blank(s) with correct word


mutations

Biology & Microbiology

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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

Biology & Microbiology

Which of the following represents a different principle for food preservation?

A. Heating B. Addition of salt C. Freeze-drying D. Smoking

Biology & Microbiology

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

Biology & Microbiology

Which of the following structures is NOT found in prokaryotic cells?

a. Flagellum b. Axial filament c. Cilium d. Pilus e. Peritrichous flagella

Biology & Microbiology