African sleeping sickness is caused by which pathogen?
A) Giardia lamblia
B) Plasmodium falciparum
C) Toxoplasma gondii
D) Trypanosoma bruceii
Ans: D) Trypanosoma bruceii
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The probability of a couple having either a boy or a girl is ½. However, many families have more boys than girls and VICE VERSA. Why is the observed ratio of boys to girls in typical families different than the predicted ratio?
A. There is a large random sampling error due to the small size of families. B. There is a small random sampling error due to the small size of families. C. Humans are more heterozygous than is predicted by random sampling. D. The sex of each child is determined independently. E. Two of the answers are correct. There is a large random sampling error due to the small size of human families and the sex of each child is determined independently.
The nuclear envelope begins to break up in late
a. anaphase. b. interphase. c. metaphase. d. prophase. e. telophase.
Which of the following statements is
CORRECT about mutation?
a. Mutations caused by environmental factors are always repaired. b. Mutations occurring during the replication process are always harmful. c. Mutations only occur during DNA replication. d. Mutations occurring during the replication process only affect the secondary structure of proteins. e. Mutations are permanent changes in the base sequence of DNA.
In a reflex arc, the correct sequence of cell types through which an electrical signal would pass would be
A. motor neuron ? sensory neuron ? interneuron in the PNS B. sensory neuron ? motor neuron ? interneuron in the CNS C. sensory neuron ? interneuron in the CNS ? motor neuron D. motor neuron ? interneuron in the PNS ? sensory neuron