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.

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

The ABO blood types have ____ different genotypes

a. 4 b. 6 c. 8 d. 12 e. 16

Biology & Microbiology

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

Biology & Microbiology