One of the considerations scientists have when breeding for certain characteristics in cultivated crops such as rice or corn is to look for:
A. wild type genes
B. plant adaptations to certain environmental conditions
C. plants that generally grow where other plants cannot grow
D. plants that are stressed
E. plants that have good characters for leaf adaptations
B. plant adaptations to certain environmental conditions
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Limbs like arms, legs, and the fins of whales are part of the:
A. axial skeleton. B. appendicular skeleton. C. mobile skeleton. D. central skeleton.
Which of the following statements about tunicates is incorrect?
A. Tunicates are nonvertebrate chordates. B. Tunicates are all marine animals. C. Tunicates are sessile as adults. D. Tunicate larvae are tadpole-like with all of the basic chordate characteristics. E. Tunicate larvae can reproduce.
The liver, pancreas, and lining of the digestive tract come from ________
A) ectoderm B) endoderm C) mesoderm D) endometrium
Why are early symptoms of a Francisella tularensis infection often difficult to diagnose?
A) Symptoms are often mild and go unnoticed. B) The bacteria do not grow in culture. C) Patient symptoms are the only indication that leads to a diagnosis. D) Symptoms progress so slowly it can be months before the patient seeks medical care. E) Early symptoms can vary based on how the bacteria are transmitted.