Place the types of RNA molecules in correct size order, from smallest to largest.
A) mRNA, tRNA, rRNA
B) aRNA, bRNA, cRNA
C) tRNA, rRNA, mRNA
D) tDNA, rDNA, mDNA
C) tRNA, rRNA, mRNA
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Answer the following statements true (T) or false (F)
1. In aquatic ecosystems, zooplankton are consumed by phytoplankton. 2. Zooplankton are heterotrophs. 3. Biomass is always highest at the lowest trophic level of a food web. 4. Most of the Earth's phosphorus is trapped in sedimentary rocks. 5. Assimilation is the process by which inorganic substances are incorporated into organic molecules.
During unfavorable growth conditions, many protozoa can convert to a resistant, dormant stage called a(n) ________.
A. trophozoite B. cyst C. sporozoa D. endospore E. seed
Some bacteria in the deep oceans use iron as an
energy source to make carbohydrates from carbon dioxide. These bacteria would be classified as
a. chemoautotrophs. b. chemoheterotrophs. c. photoautotrophs. d. photoheterotrophs. e. decomposers
Specificity refers to ____
a. the ability of MHC markers to identify foreign cells b. the ability of macrophages to destroy bacteria c. the ability of the complement system to form membrane attack complexes d. the formation of specific receptors on T and B cells e. the formation of specific memory cells after an infection