Which of the following statements regarding Q fever is incorrect?
A. The causative agent, Coxiella burnetii, produces resistant endospore-like structures.
B. The disease is mild, and most cases go undetected.
C. Symptoms include fever, muscle aches, rash, and occasionally pneumonia.
D. The causative agent, Coxiella burnetii, is transmitted by lice.
E. Humans can be infected from the airborne spread of particles from infected animals.
Answer: D
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Which of the following genetic processes may be most helpful in accounting for the Cambrian explosion?
A) binary fission B) mitosis C) random segregation D) gene duplication E) chromosomal condensation
A mass extinction, perhaps caused by a large asteroid hitting Earth near the Yucatan peninsula in the Cretaceous period, produced_____________, which created uninhabitable conditions.
A. active tectonic plate movements that rapidly repositioned continental plates B. All of the answer choices are correct. C. massive volumes of soot, and triggered major climate changes D. forest and range fires over hundreds of years E. a large numbers of volcanic eruptions for millions of years
Which line of defense is most important?
What will be an ideal response?
Crossing over
a. generally results in binary fission. b. involves nucleoli. c. involves breakages and exchanges being made between sister chromatids. d. alters the composition of chromosomes and results in new combinations of alleles being channeled into the daughter cells. e. is the same as disjunction.