Which of the following statements concerning transcription in bacteria is FALSE?
A. It occurs in the nucleoid region.
B. Sigma factors are parts of RNA polymerase that recognize promoter regions.
C. Different RNA polymerases are required for synthesis of mRNA, rRNA, and tRNA.
D. Termination is either self-induced or due to the presence of Rho protein.
E. There are a variety of sigma factors that affect transcription.
Answer: C
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A lichen is made up of which two types of organisms?
A. a fungus and a nonvascular plant species B. a fungus and an algal species C. an alga and a vascular plant species D. an alga and a nonvascular plant species E. a fungus and either an algal or bacterial species
Where do the reactions of cellular respiration occur?
A) in the nucleolus of the nucleus B) in the ribosomes of the rough endoplasmic reticulum C) in the matrix of the mitochondria D) in the hydrophobic core of the plasma membrane
A tabacco plant can be made to express a gene from fireflies, resulting in the emission of light. Which of the following is the basis for this phenomenon?
A. Chloroplasts can be made to produce light if firefly proteins are injected into plant cells B. Fireflies and tobacco plants share a recent common ancestor C. Fireflies and tabacco plants are infected by the same kinds of bacteria D. Transcription and translation are fundamentally similar in both fireflies and tobacco plants E. Most enzymes in fireflies have the same amino acid sequence as the enzymes in tabacco plants
In a branched pathway with many end products, an abundance of one of the end products will usually inhibit ________.
A. the first committed step in the branch of the pathway leading to the production of that particular product B. the last step before the branch leading to the production of that particular end product C. the last step in the production of that particular product D. the first step in the set of pathways