Which of the following is a hypothesis to explain the origin of the eukaryotic cell?
A. A eukaryotic cell evolved first, then
incorporated a proteobacterial cell that
became a mitochondrion.
B. A eukaryotic cell evolved first, then
incorporated a cyanobacterial cell that
became a chloroplast.
C. A cyanobacterial cell became incorporated
into an archaeon the same time that
eukaryotes developed.
D. A eukaryotic cell evolved first, then
incorporated a cyanobacterial cell that
became a mitochondrion.
E. None of the answers options is correct.
A
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How many DNA triplets encode 60 amino acids?
A. 180 B. 30 C. 20 D. 60
Would meiosis, when it was discovered, have been understood without Mendel's work? Explain why or why not,
using Mendel's three key findings about inheritance.
What will be an ideal response?The blood works with the urinary system by
a. carrying wastes for removal. b. carrying nutrients. c. carrying heat produced by muscles. d. carrying carbon dioxide waste. e. carrying hormones.
DNA replication occurs
a. during both mitosis and meiosis. b. only during mitosis. c. only during meiosis. d. during the S phase. e. during G2.