Nutrient poor soils and dominant evergreen
angiosperm trees dominate this biome.
a. boreal forests
b. chaparral
c. deserts
d. tropical rain forests
e. temperate deciduous forests
D
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Plants that have leaves arranged in a rosette
A) Have a circular arrangement of leaves and long internodes B) Are low growing because they have no stems whatsoever C) have greatly shortened internodes D) always have compound leaves
Which of the following best describes the double-helix of DNA?
A. It has directionality B. The strands are arranged in an anti-parallel arrangement C. The strands are complementary D. All of the answers are correct
Most protein synthesis happens on the surface of the ___________
A. rough endoplasmic reticulum D. mitochondrion B. smooth endoplasmic reticulum E. nucleus C. Golgi complex
For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below. Not all words or phrases will be used; each word or phrase should be used only once
Cells signal to one another in various ways. Some use extracellular signal molecules that are dissolved gases, such as __________________, which can diffuse easily into cells. Others use cytokines, which bind to cytokine receptors. Cytokine receptors have no intrinsic enzyme activity but are associated with cytoplasmic tyrosine kinases called __________________s, which become activated on the binding of cytokine to its receptor and go on to phosphorylate and activate cytoplasmic transcriptional regulators called __________________s. Some intracellular signaling pathways involve chains of protein kinases that phosphorylate each other, as seen in the __________________ signaling module. Lipids can also relay signals in the cell, as we observe when phospholipase C cleaves the sugar-phosphate head off a lipid molecule to generate the two small messenger molecules __________________ (which remains embedded in the plasma membrane) and __________________ (which diffuses into the cytosol). cyclic GMP MAP kinase STAT diacylglycerol NO TGF? IP3 Ras JAK SMAD Fill in the blank(s) with correct word