The MOST common route of transmission of Salmonella typhi worldwide is through
A) contaminated food.
B) contaminated water.
C) direct contact.
D) insect vectors.
Answer: C
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Proteins that are functionally less important for the survival of an organism generally evolve _____ more important proteins
A. more slowly than B. more quickly than C. at the same rate as
Whole-cell movements involve the coordinated activity of ____
a. microtubules only b. microfilaments only c. blastomeres only d. microtubules and microfilaments e. microtubules, microfilaments and blastomeres
The energy required for plants to perform photosynthesis comes from which of the following?
a. mechanical energy b. light energy c. chemical energy d. kinetic energy
What is the half-life of the decay of uranium
238 to lead 206?
a. 2.5 million years. b. 220 million years. c. 1.2 billion years. d. 2.5 billion years. e. 4.5 billion years