When Mendel crossed yellow-seeded and green-seeded pea plants, all the offspring were yellow seeded. When he took these F1 yellow-seeded plants and crossed them to green-seeded plants, what genotypic ratio was expected?
A) 1:2:1
B) 3:1
C) 9:3:3:1
D) 1:1
E) 1:1:1:1
Answer: D
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The major site of cell membrane synthesis is the
A. plasma membrane. B. endoplasmic reticulum. C. nucleus. D. lysosome.
The cell walls of plant cells and prokaryotic cells are structurally identical
a. true b. false
An arg- strain of E. coli is transformed with a plasmid carrying the wild-type (arg+) gene. The transformed cells are replica-plated to two minimal medium plates: one supplemented with arginine and one lacking arginine
The transformed cells would grow on A) only the plate supplemented with arginine. B) only the plate lacking arginine. C) both plates. D) neither plate. E) the plate supplemented with arginine, but only if a mutation occurred.
What is meant by the term antiparallel, when applied to DNA structure?
a. The 5' end of one strand is directly paired with the 5' end of the other strand. b. The double helix twists; it is not perfectly parallel. c. The 5' end of one strand is directly paired with the 3' end of the other strand. d. One strand has a negative charge, and the other strand has a positive charge.