Nondisjunction of the X chromosomes may occur during formation of gametes and produce two kinds of eggs. If normal sperm fertilizes these two kinds of eggs, which of the following pairs of genotypes are possible?
A) XX and XY B) XYY and YO C) XXY and XO D) XYY and XO
Answer: C
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In DNA sequence analysis
A. the + strand of DNA is used. B. the start codon is ATG. C. ORFs are searched for. D. codon usage is a helpful indicator for protein coding areas. E. All of the choices are correct.
Which combination of conditions would increase the rate of diffusion through a semipermeable membrane the most? I. steeper concentration gradients II. higher temperatures III. larger molecules
a. I only b. II only c. I and II d. II and III e. I, II, and III
What do gametes, spores, and gametophyte
generations have in common?
a. They are all diploid. b. They are all haploid. c. They are limited to vascular plants. d. They have nothing in common. e. They are asexual structures
Replication of DNA molecule produce
A. Three DNA and one RNA molecules B. One DNA and one mRNA molecules C. Two different molecules of DNA D. One tRNA and one rRNA molecules E. Two exact copies of DNA molecules