Which of the following processes can be used to bring nutrients into a cell against a concentration gradient?
A. Passive diffusion
B. Active transport
C. Facilitated diffusion
D. Active transport and facilitated diffusion
Answer: B
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Comparisons of DNA sequences within the human species have revealed many variations. Which of the following variations involves duplication of relatively long stretches of chromosomes, often including the duplication of protein-coding genes?
A) CNVs B) SNPs C) STRs D) Transposable elements
What is one of the functions of nucleic acids?
A) They transmit genetic information. B) They help produce energy within the cell. C) They regulate the flow of materials into the cell. D) They energize chemical reactions within the cells.
Which of the following factors would make the strongest contribution to global climate change?
A. over-harvesting of wild species for consumptive value B. large-scale deforestation C. an increase in soil erosion leading to siltation of rivers and estuaries D. disruption of the waste recycling by decomposers E. drainage of wetlands producing a disruption of water purification
Primers are used in both PCR and in DNA sequencing. What is the purpose of the primers?
A. to separate the DNA template strands B. to provide a 3'-OH for DNA polymerase to build a new DNA strand C. to terminate synthesis of the growing DNA strand D. to separate various-sized DNA products E. to add nucleotides to a growing DNA strand