1. Which of the following is NOT a characteristic of life?
Homeostasis
DNA
Movement
Reproduction
Movement
Explanation: All living things respond to their environment, but not all living things can move.
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What allows fetal hemoglobin to remove oxygen from maternal hemoglobin?
A. Fetal hemoglobin has an extra heme group. B. Oxygen is more soluble in fetal blood than maternal blood. C. Fetal hemoglobin has a higher affinity for oxygen than does maternal hemoglobin. D. There are two times more fetal than maternal hemoglobin molecules in the placenta. E. Fetal hemoglobin molecules are much larger than maternal hemoglobin molecules.
Assume that a bacterial cell produces a Lac repressor that is able to bind to the operator sequence of the lac operon but
cannot bind allolactose. Explain the effect on transcription of the lac operon is the presence and absence of lactose.
What will be an ideal response?The structure of a DNA molecule is analogous
to a
a. paper clip. b. ladder. c. fork. d. rope. e. coiled spring
To make the skin more flexible and remove wrinkles, ________ could be injected beneath a person's skin.
A. cellulose B. laminin C. proteoglycan D. fibronectin E. collagen