Which of the following best describes the sequence of DNA compaction, beginning with least compacted to most compacted?
A. nucleosomes, DNA strand, chromosomes
B. DNA strand, nucleosomes, chromosomes
C. DNA strand, chromosomes, nucleosomes
D. chromosomes, nucleosomes, DNA strand
Answer: B
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Trophic-level transfer efficiency averages about
A. 1%. B. 25%. C. 33%. D. 10%. E. 65%.
During high tide a plant or animal would be at risk of
A. dehydration by facilitated diffusion of salts. B. dehydration due to active transport of salts. C. cells bursting due to active transport of salts. D. cells bursting by osmosis of water. E. dehydration by osmosis of water.
____ are alternative forms of a gene that govern the same feature, such as eye color, and occupy corresponding
positions on homologous chromosomes. a. Alleles b. Loci c. Homozygotes d. Coupled traits e. Heterozygotes
Why are viruses called obligate intracellular parasites?
a) They must use a host cell's amino acids to synthesize proteins. b) They must use a host cell's nucleotides for transcription and replication. c) They must use a host cell's metabolic enzymes and pathways to obtain energy. d) They must use a host cell's ribosomes to synthesize proteins. e) All of the above.