Lipid molecules composed of four joined carbon rings, such as cholesterol, are known as ________
Fill in the blank(s) with correct word
steroids
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The only evolutionary process that leads to adaptive change is:
A. mutation. B. migration. C. natural selection. D. genetic drift. E. All of the answer options are correct.
Why is nonhomologous end joining (NHEJ) more frequent in eukaryotes?
A. Bacteria replicate frequently and so can use recombination repair to repair most double-strand breaks. B. The period of time between DNA synthesis events is longer so double-strand breaks occurring outside of the period require NHEJ. C. NHEJ is a mutagenic process that is tolerated better in larger genomes. D. Some eukaryotic cell types use NHEJ as a source of gene variation. E. All of the choices given are correct.
An RNA molecule (for example, rRNA or tRNA) within a cell can fold into complex three-dimensional shapes for which reason?
a. It contains the base uracil rather than thymine. b. It contains the sugar ribose rather than deoxyribose. c. It is double-stranded. d. It is more primitive than DNA. c. It is single-stranded.
Name two forms of antagonistic coevolution
What will be an ideal response?