Describe the value of using twins in the study of questions relating to the relative impact of heredity versus environment
What will be an ideal response?
Monozygotic twins are derived from the splitting of a single fertilized egg and are therefore of identical genetic makeup. When such twins are raised in the same versus different settings, an estimate of relative hereditary and environmental influences can often be made.
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All of the following are advantages to expressing genes in yeast except:
A. Many strains lack cell walls. B. They require inexpensive media for growth. C. They are easy to grow and manipulate. D. Folding and expression of eukaryotic genes is frequently more efficient in yeast than in bacteria. E. The expression of cloned genes can be regulated by media components.
Briefly define a biogenous ooze and describe two types
What will be an ideal response?
When an end product of a reaction is in excess and inhibits the first enzyme of the pathway, this is an example of negative feedback.
a. true b. false
A target cell that is affected by a particular steroid hormone would be expected to have
A) an intracellular receptor protein that binds the hormone. B) a cell-surface receptor protein that binds the hormone. C) enzymes that are activated or inactivated by the intracellular hormone-receptor complex. D) enzymes that are activated or inactivated by the hormone's second messenger.