What are the four major types of biological molecules?
What will be an ideal response?
carbohydrates, lipids, proteins, and nucleic acids
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Which of the following is one of Chargaff’s
rules?
a. different organisms have different DNA sequences b. the DNA molecule is a double helix c. the two strands in a DNA molecule run in opposite directions d. the backbone of a DNA molecule is on the outside e. all of these are Chargaff’s rules
Which group of plants was dominant during the Carboniferous era (360–300 mya)?
1.gymnosperms 2.eudicots 3.angiosperms 4.ferns and other seedless plants
In amphibian eggs, a pigmented area called the ____ appears after fertilization.
A. gray matter B. gray crescent C. blastomere D. cleavage plane E. gray oocyte
Universal precautions is designed to protect
A. the general public. B. patients. C. health care providers. D. All of these choices are correct.