Evidence that organic molecules could be synthesized from the inorganic molecules methane, carbon dioxide, ammonia, hydrogen gas, heat, and energy was provided by which of the following scientists?

a) Cuvier
b) Miller and Urey
c) Schmidt and Tyler
d) Lydig and Wallace
e) Oparin and Haldane


Answer: b) Miller and Urey

Biology & Microbiology

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Which statement does NOT correctly describe hormones that can directly enter a cell? 

A. Steroid hormones can enter directly into cells because of their hydrophobic makeup. B. Water-soluble hormones can enter directly into cells because of their nonpolar makeup. C. Steroid hormones dissolve poorly in the plasma and are transported to target cells via special protein carriers. D. Once these hormones enter a cell, they bind to a cytoplasmic receptor and travel as a complex to the nucleus, or they may bind to the receptor after entering the nucleus.

Biology & Microbiology

Segmentation is the primary means of mechanical breakdown of food in the digestive tract

Indicate whether the statement is true or false

Biology & Microbiology

Which of the following statements is true?

A. Gene mutations never occur independently of each other. B. Gene mutations are very common. C. Ionizing radiation is caused by chromosomal damage. D. Mutations are random. E. The loci of gene mutations can be predicted.

Biology & Microbiology

The type of microscope in which you would see brightly illuminated specimens against a black background is

A. phase-contrast. B. dark-field. C. bright-field. D. fluorescence. E. electron.

Biology & Microbiology