A man who has normal hearing and has a recessive deafness allele on chromosome 17 marries a woman who also has normal hearing and also has a recessive deafness allele, but this allele is on chromosome 3. The probability that their children will be deaf due to either of these mutated genes is closest to

A) 100%.

B) 50%.

C) 25%.

D) 0%.


D) 0%.

Biology & Microbiology

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In all cells, genes are composed of

A) nucleic acids. B) mRNA. C) proteins. D) chaperones.

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Viral infection is a major cause of cancer

a. True b. False Indicate whether the statement is true or false

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All of the following are tenets of the cell theory that

research with modern microscopes supports EXCEPT that a. all organisms consist of one or more cells. b. the cell is the smallest unit that retains the characteristics of life. c. since the first cell, each new cell is descended from previous cells. d. each cell is composed of products that it manufactures. e. cells may arise spontaneously under certain laboratory conditions.

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Which of the following is a large protein complex in the thylakoid membrane, which consists of pigments and other molecules that convert light energy to chemical energy in photosynthesis?

A. Photosystem B. Photosynthesizer C. Photolysis D. Electron transfer phosphorylation E. Stomata

Biology & Microbiology