Microscopic or macroscopic degenerative changes or abnormalities in infected host cells and tissues are called ________.
Fill in the blank(s) with the appropriate word(s).
cytopathic effects
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How can only four nucleotides account for the extreme diversity of traits within living things?
a. The biochemical structure of nucleotides differs between cell types. b. The nucleotides can base pair with any other nucleotide. c. Nucleotides are arranged in many different sequences. d. Different proteins can be encoded from the same DNA sequence. e. Complex organisms have more than four types of nucleotides.
In some species, the sex of the future
individual is decided by environmental conditions and not by sex chromosomes. In which of the following species is sex decided by temperature?
a. birds b. fruit flies c. frogs d. rabbits e. zebras
Select the best response to the question. ?
?Lyme disease, an illness spread by ticks, is an example of: A) ?transmission by direct contact. B) common vehicle transmission.? C) ?mechanical vector transmission. D) ?biological vector transmission.
Why are "fortified" foods more likely to spoil than are unfortified foods?
A) The added vitamins and minerals can promote microbial growth. B) The foods are fortified by the addition of vitamin-producing microbes. C) Every step of modification or manipulation of food increases the chance for contamination. D) Vitamins are frequently contaminated by the microbes that produced them. E) The vitamins require a neutral pH environment, which is suitable for many microbes.