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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At which level of protein structure are interactions between the side chains (R-groups) most important?
A) primary B) secondary C) tertiary D) quaternary E) primary, secondary, tertiary, and quaternary
Which macromolecule has the highest diversity of functions?
A. carbohydrates B. proteins C. nucleic acids D. lipids E. glycolipids
The gonads produce steroids. The specific steroid-producing organelle in gonad cells is
A. ribosomes. B. lysosomes. C. smooth endoplasmic reticulum. D. mitochondria. E. contractile vacuole.
The morphological species concept:
A) is not applicable to all forms of life, past and present B) defines species by observable and measurable physical traits C) is based on the idea of reproductive isolation D) requires that an organisms DNA be analyzed E) all of the above