The sequence of subunits in the DNA "backbone" is
A) -phosphate-sugar-phosphate-sugar-phosphate-sugar-.
B) -base-sugar-phosphate-base-sugar-phosphate-.
C) -sugar-base-sugar-base-sugar-base-sugar-base-.
D) -base-phosphate-sugar-base-phosphate-sugar-.
E) -base-phosphate-base-phosphate-base-phosphate-.
A
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Which type of reproduction is most commonly found among the fungi?
A. sexual reproduction between two different mating types and production of haploid spores B. sexual reproduction in which two haploid cells fuse, forming a dikaryotic cell whose nuclei fuse (karyogamy) and then produce haploid spores C. asexual reproduction in which the haploid parent forms haploid spores D. asexual reproduction in which the haploid parent produces diploid spores
Considering the electromagnetic spectrum, identify likely mutagens from the following list: radio waves, microwaves, infrared, ultraviolet, X rays, gamma rays, cosmic rays
What will be an ideal response?
Select the best response to the question. ?What is the most common cause of bronchiolitis?
A) respiratory syncytial virus B) ?Haemophilus influenzae type B C) influenza virus D)rhinovirus
Which of the following were instrumental in DISPROVING spontaneous generation?
a. Pasteur's experiments using a specialized swan-necked flask that prevented microbes from entering flasks open to the air. b. The theory set forth by Rudolph Virchow, stating that living cells arise only from preexisting cells. c. Needham's experiments showing that even boiled vials of meat broth, when covered, became cloudy, teeming with microorganisms after a few days. d. Spallanzani's experiment in which flasks of meat broth were boiled and then melted shut, preventing the passage of air altogether.