When is a test-cross used?
A. To determine the genes in a dominant organism
B. To determine the genes in a codominant organism
C. To determine the genes in a recessive organism
Answer: A. To determine the genes in a dominant organism
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Which of the following elements are cycled, due in part to the actions of archaeons and bacteria?
A. carbon B. sulfur C. nitrogen D. All of these elements are cycled.
Which of the following statements is false?
a. It is assumed that lower animals are incapable of perception. b. Humans, as the most complex organisms, have all of the sensory organs found in lower forms. c. Mechanoreceptors are responsible for the senses of equilibrium and hearing. d. Nociceptors detect damage to tissues. e. A lobster reacts to the boiling water in which it is placed to cook.
The smallest particles occurring in soil are referred to as
A) clay. B) gravel. C) sand. D) silt.
The time required for a control agent to kill 90% of the microorganisms or spores in a sample under specified conditions is called
A) The contact time B) The D value C) The Z value D) None of the above