Compounds of tin, mercury, arsenic, and copper are no longer used to prevent microbial growth in cooling water primarily because
A. antibiotics are cheaper.
B. other chemicals were shown to be much more effective.
C. microbes developed resistance to these metals.
D. their use contributes to serious pollution of natural waters.
E. All of the choices are correct.
D
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Which of the following characteristics is NOT
present in all animal phyla? a. multicellularity b. organ systems c. heterotrophy d. diploidy e. sexual reproduction
If an X-linked disorder is lethal to the affected individual prior to the age at which one reaches reproductive maturation, the lethality will be expressed only in males. Why is this so?
What will be an ideal response?
The ________ is the innermost layer of the eye that is lined with almost a quarter-billion photoreceptors
Fill in the blank(s) with correct word
Which molecule, when moving across a plasma membrane, would require the most ATP to be used?
A) a water molecule B) a simple sugar, such as glucose C) a dissolved gas, such as carbon dioxide D) an ion moving against a concentration gradient