What can DNA typing tell us about George Washington's false teeth?
What will be an ideal response?
Answer: DNA typing is the technique of making DNA profile which is unique for each individual. Since DNA is present only in cells of living beings, its presence also differentiate the living things from non living ones. So, DNA typing of George Washington's false teeth can tell us if it was made of part of real teeth of George Washington only or if part of teeth was taken from some one else. It can also tell if the false teeth was made of non living things or it had part of real teeth with some non living things deposited on it.
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The outside of a neuron is positively charged at resting potential. Why don't negative ions exit from the cell to normalize charge across the membrane?
A. The positive charge outside the cell repels negative ions. B. There are no negative ions inside the cell. C. All of the chloride ions are already outside the cell. D. The negative charge inside the cell is carried by large proteins that cannot diffuse through the membrane.
Oxyhemoglobin contains _____
a. oxygen bound irreversibly to a heme group b. carbon dioxide c. carbonic anhydrase d. bound oxygen in the absence of a heme group e. oxygen bound reversibly to a heme group
Starting from the wild mustard Brassica oleracea, breeders have created the strains known as Brussels sprouts, broccoli, kale, and cabbage. Therefore, which of the following statements is correct?
A) In this wild mustard, there is enough heritable variation to permit these different varieties. B) Heritable variation is low in wild mustard—otherwise this wild strain would have different characteristics. C) Natural selection is rare in wild populations of wild mustard. D) In wild mustard, most of the variation is due to differences in soil or other aspects of the environment.
Which of the following characteristics or actions is associated with a steroid hormone?
A. cyclic AMP B. activation of proteins present in an inactive form C. the second messenger D. production of new proteins E. binding of a protein to a surface receptor on the plasma membrane