Similar to the tundra, but without a permanent ice layer, this biome is characterized by low and slow-growing plants with little protection from UV radiation
A. taiga
B. alpine
C. chaparral
D. deciduous forest
E. rain forest
B
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The streptomycetes form spores on their substrate mycelia.
Answer the following statement true (T) or false (F)
Which ion is actively transported to regulate pollen growth and fertilization?
a. hydrogen b. potassium c. sodium d. calcium e. magnesium
What is a main function of the structure in the accompanying figure labeled "B"?
a. It controls cell shape. b. It separates DNA during cell division. c. It helps nerve cells lengthen. d. It is found in hair. e. It helps regulate DNA replication.
One mechanism by which viruses may cause cancer is to interrupt the genetic regulatory sequences of repressor proteins. Which of the following types of viruses is most likely to be involved in causing cancer by this mechanism?
A. +ssRNA viruses B. dsRNA viruses C. -ssRNA viruses D. retroviruses E. both +ssRNA and -ssRNA viruses