The vector involved in African sleeping sickness is the ________.
A. tsetse fly
B. hard-bodied tick
C. sand fly
D. reduviid "kissing" bug
E. Anopheles mosquito
Answer: A
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Parasitism is a density-independent factor of population control
Indicate whether the statement is true or false.
If a cell had a chromosome number of four,
after anaphase but before the cytoplasm divides, how many chromosomes does the cell have?
a. 2 b. 4 c. 8 d. 16 e. none of these
The substitution of one base pair for another in double-stranded DNA is called a(n):
A. silent mutation. B. risk factor. C. allele. D. heterozygote advantage. E. point mutation.
Which property is true of living things?
a. They are stable over time. b. They are stable over many generations. c. They use protein as their hereditary material. d. They must obtain all organic molecules of life from external sources. e. They consist of one or more cells.