Biologists have found evidence that eukaryotic cells evolved from prokaryotic organisms by a process of intracellular ________.
A. mutualism
B. symbiosis
C. commensalism
D. parasitism
Answer: B
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Which situation demonstrates only the genetic influence on a trait?
A) Hair dye turns Angela's brown hair to red. B) Sandy's hair becomes blonder when she spends time out in the sun. C) Jen has brown hair, just like her mother and father. D) Identical twins Kiera and Tanya have different colored hair.
What kinds of bonds link the two strands of a double helix to each other?
A. hydrogen B. ionic C. hydrophobic D. covalent
Which of the following is NOT part of the pathway that water and dissolved minerals (i.e., Fe, K, Mg, etc.) follow as they move from the soil into a plant to the xylem?
A. through plasmodesmata B. between cells C. through apoplastic transport D. through phloem E. through symplastic transport
Genetic information in DNA and RNA is stored as a sequence of three nucleotide bases. On DNA a group of three nucleotides is called a _____, while on the complementary strand of mRNA, this sequence is called a ____ .
a. genome / proteome b. intron / exon c. base triplet / codon d. codon / anticodon e. base triplet / anticodon