In the summer, a lake's thin layer of water beneath the top layer where the temperature drops rapidly is known as the ____.
A. halocline
B. thermocline
C. pycnocline
D. hypocline
E. hypercline
Answer: B
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Which of the following correctly lists the terms in hierarchical order from smallest to largest?
a. nucleotides, DNA, genes, proteins, genome b. DNA, genes, proteins, genome, nucleotides c. genome, genes, proteins, nucleotides, DNA d. proteins, genes, genome, DNA, nucleotides e. genes, genome, nucleotides, DNA, proteins
Which of the following is not true of influenza?
A. H5N1 is the bird flu strain that may cause a pandemic. B. Influenza B viruses undergo both antigenic drift and antigenic shift. C. Antigenic drift changes the antigens to reduce immune recognition. D. Antigenic shift causes changes in the RNA strands. E. Influenza has glycoprotein spikes of hemagglutinin (H) and neuraminidase (N).
Answer the following statements true (T) or false (F)
1.Soil scientists use relative amounts of sand, silt, and clay to classify soils. 2.The B horizon soil consists of most of the humus found in soil. 3.The "wearing away" of soil by wind and water is called erosion. 4.Chemically, nutrients from inorganic fertilizers are not equivalent to nutrients from manure or compost. 5.A typical, mature tree consumes only about 5 gallons of water a day.
In S. pyogenes, which of the following interferes with phagocytosis?
A. M protein B. Protein A C. Collagen D. Pilin