After a fragment of DNA containing the gene of interest has been inserted into a vector, how are the gaps between the two pieces of DNA sealed together?
A. DNA polymerase catalyzes the formation of hydrogen bonds in the DNA backbone.
B. DNA gyrase creates tension in the DNA backbone to hold the molecule together.
C. DNA helicase causes the double helix to wind into its stable form.
D. DNA ligase catalyzes the formation of covalent bonds in the DNA backbone.
E. Restriction enzymes have the ability to join the two DNA fragments.
D. DNA ligase catalyzes the formation of covalent bonds in the DNA backbone.
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Which of the following likely contributed to the diversification of angiosperms? Select all correct choices
A. wind-based pollination B. animal-based pollination C. a large female gametophyte D. a small female gametophyte E. increased rates of photosynthesis F. decreased rates of transpiration
The main hypothesis about the origin of the first living organisms is called ________.
A. novel design B. biogenesis C. panspermia D. chemo-evolution
A gene that affects three traits is _____
a. epistatic b. a multiple allele system c. pleiotropic d. dominant
Diploid cells of the fruit fly Drosophila have ten chromosomes. How many chromosomes does a Drosophila gamete have?
a. 1 b. 2 c. 5 d. 10 e. 20