In the intestinal bacteria Escherichia coli, the DNA segment that contains the coding for the enzymes of lactose metabolism is called the lactose ________
Fill in the blank(s) with correct word
operon
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In the fossil record, there is evidence that feathers were produced by which of the following?
A. mammals B. birds and some dinosaurs C. birds and some mammals D. birds E. dinosaurs
The master gene Hox helps to sculpt the body
plan of embryos by a. inhibiting the Dlx gene to prevent extra limbs. b. timing the activation of Dlx genes. c. causing cell death in any cell not expressing the Hox gene. d. converting sugar into energy to allow the process to go to completion. e. inducing mutations in plants.
The antigen that is found in the Rh blood type system is the ____ Antigen
Fill in the blank(s) with the appropriate word(s).
Most of the oxygen carried by the blood is
A. dissolved in the plasma. B. bound to hemoglobin molecules. C. present as tiny bubbles in the blood. D. part of sugar molecules.