Chloroplasts are thought to have evolved from cyanobacteria. Which of the following observations support this hypothesis? (Select all correct choices.)
A. They both have similar internal
membranes that organize the light reactions
of photosynthesis.
B. They both have small circular DNA
genomes.
C. They both have cell walls.
D. They both have the capability of
movement through flagella.
A,B
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The time it takes for half of a radioisotope’s atoms to
decay a. cannot be calculated. b. is used to construct the geologic time scale. c. is its half-life. d. is the same for uranium 238 and carbon 14. e. is all of these.
Define the term speciation
What will be an ideal response?
Which complex does the process of removing introns from mRNA and putting the remaining exons together occur?
a. in the anticodon b. in the polysome c. in the spliceosome d. in the ribosome
Which of the following junctions influences the passage of ions and small molecules between cells?
a. tight b. adhering c. gap d. loose e. plasma