The idea that life came to Earth from a distant planet is called
A. spontaneous generation.
B. panspermia.
C. the heterotroph hypothesis.
D. endosymbiotic theory.
B. panspermia.
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Answer the following statements true (T) or false (F)
1. If a researcher determines that 25% of a liver cell's total genome encodes genes for metabolic enzymes, then he/she should assume that metabolic enzymes make up 25% of the total protein composition of the cell. 2. Liver and muscle cells have different sets of genes. 3. A single pre-mRNA can be alternatively spliced into more than one type of mRNA. 4. If an acetyl group is added post-translationally to a protein, it can be subsequently removed.
As the resolution of a microscope system improves, the size of the smallest object that can be seen clearly
A. is smaller. B. is not affected. C. is larger.
The ABO blood types have ____ different genotypes
a. 4 b. 6 c. 8 d. 12 e. 16
In brown air fog, which substance combines with nitrogen dioxide in the sunlight to form
photochemical smog? a. carbon monoxide b. water vapor c. hydrocarbons d. sulfuric acid e. carbon dioxide