Which of the following is true of nucleosome structure?
A. Nucleosomes are composed of about 1,000 bp of DNA wrapped around a histone core.
B. Nucleosomes are composed of about 200 bp of DNA wrapped around a histone core.
C. The DNA wraps around the core nearly two times, forming a right-handed solenoidal supercoil.
D. The DNA wraps around the core nearly three times, forming a left-handed solenoidal supercoil.
E. None of these choices is correct.
B
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Which line illustrates an enzyme-catalyzed reaction?
A. Reaction 2 B. Reaction 1 C. Either Reaction 1 or Reaction 2 may be enzyme-catalyzed.
Which of the following would be considered to be a symplesiomorphy of mosses, ferns, conifers, and flowering plants?
Given the following list of characteristics:
A. Chlorophylls a & b.
B. Vascular tissue.
C. Seeds.
D. Flowers.
E. Both flowers and vascular tissue.
When you use an over-the-counter ovulation kit, what is the kit actually detecting in your urine?
1.human chorionic gonadotropin 2.estrogen 3.progesterone 4.LH
Which group of terms is in the correct developmental sequence?
a. microspore mother cell, meiosis, megaspore, female gametophyte. b. microspore mother cell, meiosis, microspore, pollen grain. c. megaspore, mitosis, female gametophyte, meiosis, endosperm mother cell. d. all of the above.