A pictogram is used to
A) compare which DNA base is present at a particular position in a conserved short DNA sequence among different species.
B) compare the frequency of two-base sequences in the genomes of species thought to be closely related based on other types of evidence.
C) visualize what the chromosomes of different species look like when condensed.
D) align long sections of the genomes of different species that are the same in sequence.
A) compare which DNA base is present at a particular position in a conserved short DNA sequence among different species.
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The total solute concentration of a solution of water and other substances (salts, proteins, etc.) is referred to specifically as its
A. osmolarity. B. tonicity. C. salinity. D. specific gravity. E. density.
The movement of the organic products of photosynthesis from the leaf to the roots is the result of what process?
a. Cellular respiration b. Replication c. Germination d. Transcription e. Translocation
What is one reason arteries can withstand higher blood pressure than veins?
A) Arteries have one-way valves to prevent blood from flowing backward. B) Arteries contain all types of blood cells, whereas veins contain only erythrocytes. C) Arteries have thick walls that contain layers of muscle and connective tissue. D) Arteries contain only oxygenated blood.
A virus was used to alter human cells. mRNA for a gene was inserted into the virus, and the virus infected the human cells and inserted the gene into the genome of the cell. What type of virus could do this?
a. the T4 bacteriophage b. a temperate phage c. a retrovirus d. all of the above