During the process of phosphorylation, ____
a. a molecule gains a phosphate group
b. a molecule synthesizes a phosphate group
c. molecules become more stable
d. molecules are passed to enzymes
e. ADP is produced from ATP
ANSWER: a
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Write the letter of the terrestrial biome with the lowest mean temperature next to 1. Sequence the
remaining biomes by increasing temperature, finishing by writing the letter of the biome with the highest mean temperature next to 4.
A. temperate deciduous forest B. savanna C. tundra D. boreal forest 1. 2. 3. 4.
Your job is to classify a newly discovered animal species. Your initial studies reveal that your specimen lacks tissues and organs and has no head, body symmetry, body cavity, or segmentation. To what phylum does this animal belong?
A) Cnidaria B) Mollusca C) Annelida D) Platyhelminthes E) Porifera
Suppose that an error in transcription alters the formation of a single tRNA molecule in a cell. The altered tRNA still attaches to the same amino acid (Phe), but its anticodon loop has the sequence AAU, which binds to the mRNA codon UUA (usually specifying leucine, Leu). What will be the effect on translation in this cell?
A. One altered tRNA molecule will be relatively inconsequential because it will compete with many "normal" ones. B. The altered tRNA will result in an amino acid variant in all copies of the protein. C. The altered tRNA will be so unstable that it will not participate in translation. D. The altered tRNA will cause this mRNA to make only nonfunctioning product. E. The tRNA-Leu will not be able to enter the ribosome to bind to the UUA codon.
Four of the following statements are true regarding roots. Which one is NOT true?
A. Roots anchor a plant in soil, and in many species, they store nutrients. B. An extensive root system provides a plant with a very large surface area for absorbing water from the soil. C. When a seed germinates, the first structure to emerge from it is a root. D. In typical monocots, a primary root is quickly replaced with a mat of adventitious roots. E. In typical eudicots, the primary root that emerges from a seed thickens and lengthens to become a fibrous root.