In snapdragons, pink-flowered plants are produced when red-flowered plants are crossed with white-flowered plants. This type of inheritance can best be described as
A. incomplete dominance.
B. simple dominant and recessive traits.
C. sex-linked traits.
D. codominance.
Answer: A
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Which one of the following ribosomal subunits has three different pieces of rRNA in it?
A. 30S B. 40S C. 50S D. 60S
The fate of a cell during development is:
A: entirely controlled by nuclear gene expression. B: independent of gene expression. C: influenced by cytoplasmic determinants. D: determined solely by inducers. E: not altered by reagents that interfere with microtubule formation.
In what way do the membranes of a eukaryotic cell vary?
A) Phospholipids are found only in certain membranes. B) Certain proteins are unique to each membrane. C) Only certain membranes of the cell are selectively permeable. D) Only certain membranes are constructed from amphipathic molecules. E) Some membranes have hydrophobic surfaces exposed to the cytoplasm, while others have hydrophilic surfaces facing the cytoplasm.
Which characteristic is not true for an essential element?
a. It may play only one role in plant metabolism. b. It is necessary for normal growth and reproduction. c. It may be contained in plant seeds in high enough quantities to sustain the adult plant. d. Occasionally, it can be functionally replaced by another element. e. It may be required in only trace amounts.