What is an economic impact of fungi?
a. production of bread and wine
b. killing pests on crops
c. production of anticancer drugs
d. all of these are economic impacts of fungi
Answer: d. all of these are economic impacts of fungi
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Some RNA molecules can function like enzymes. These particular enzymatic RNA molecules are called
A) ribosomes. B) mRNA. C) ribozymes. D) RNase.
When a person has laryngitis, he or she cannot speak. What must happen to permit normal speech?
A) The epiglottis must cover the glottis. B) The swelling of the vocal cords must decrease so they can vibrate normally. C) Inflammation in the bronchioles has to go down before enough air can enter the lungs. D) Inflammation in the trachea has to go down before enough air can enter the lungs.
Which of the following statements about sister chromatids is TRUE?
A. Sister chromatids are produced during mitosis. B. Sister chromatids are exact copies of each other and are formed just prior to cell division. C. Sister chromatids are held together by complementary base pairing of DNA at the centromere. D. After mitosis, sister chromatids contain the same genes, but they may have different alleles. E. All of these statements about sister chromatids are TRUE.
Which scientist showed that anthrax was caused by the bacterium Bacillus anthracis?
A) Joseph Lister B) Antonie van Leeuwenhoek C) Ignaz Semmelweis D) Robert Koch E) Louis Pasteur