Cell walls are used by many different organisms for protection from their environment and structural support. These cell walls must obviously be insoluble in water; otherwise, they would dissolve the first time an organism got wet
Which of the following carbohydrates would you expect to be most soluble in water?
A) starch
B) peptidoglycan
C) cellulose
D) chitin
Answer: A
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The two strands of the DNA double helix are held together by
A) 5' to 3' attraction. B) hydrogen bonds between nucleotide bases. C) codons. D) peptide bonds between nucleotide bases.
The bacterium that causes botulism disease is harmless until it:
a. is infected by prions. b. is infected by lytic bacteria. c. is irradiated by UV radiation. d. contains a certain prophage DNA. e. is infected by certain retroviruses.
Which of the following is known as a Philadelphia chromosome?
A) a human chromosome 22 that has had a specific translocation B) a human chromosome 9 that is found only in one type of cancer C) an animal chromosome found primarily in the mid-Atlantic area of the United States D) a chromosome found only in mitochondria
Which of the following is an example of sex-limited inheritance?
A) cat fur length B) hemophilia C) beard formation in humans D) hair color in humans E) human baldness