Alleles are described as ________
A) homologous chromosomes
B) environmental factors that affect gene expression
C) alternate versions of a gene
D) alternate phenotypes
C
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In order for DNA molecules to undergo
recombination, a. they must be from the same species. b. their strands must separate as in replication. c. they must be cut and spliced at specific nucleotide sequences. d. one of the two DNA strands must be degraded. e. they must first be transcribed
Which of the following can be a transdominant mutation in partial diploid cells?
A) lacZ- B) PlacI- C) lacIS D) lacY- E) lacI-
Multicellular eukaryotes arose about:a
3.8 billion years ago. b. 2 billion years ago. c. 1.3 billion years ago. d. 600 million years ago. e. 250 million years ago.
Which of the following statements about herpesviruses is false?
A) Herpesviruses reproduce inside the host cell's mitochondria. B) Herpesviruses acquire their envelopes from the host cell nuclear membrane. C) Herpesviruses may remain dormant for long periods of time while inside the host cell nucleus. D) Herpesviruses may cause cold sores or genital sores to appear during times of physical or emotional stress.