The oldest fossil organisms presently known have been dated at approximately how many years old?
A) more than 4.5 billion
B) less than 1.7 billion
C) 4.5 billion
D) 1.7 billion
E) 3.4 billion
E
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M. catarrhalis can be described as a:
a. gram-positive diplococcus. b. gram-negative diplococcus. c. gram-negative coccobacillus. d. gram-negative bacillus.
Most antihelminthic medications act only against the pathogens, not the human host.
Answer the following statement true (T) or false (F)
The human genome comprises:
a. an X and a Y chromosome. b. a homologous pair of chromosomes. c. 46 chromosomes. d. 46 pairs of chromosomes. e. 23 chromosomes.
Which of the following statements is false?
A) When an allele is dominant, the heterozygous combination is the same phenotypically as one of the homozygotes. B) Epistasis would not be expected to occur in a biochemical pathway. C) Dominance refers to the form of expression of a gene in relation to its allele (or alleles). D) Epistasis refers to a gene (or genes) of one pair masking the expression of a gene (or genes) at a different locus. E) Epistasis is a nonallelic interaction; dominance is an allelic interaction.