During aerobic decomposition of organic matter the primary gas produced is
A. oxygen.
B. hydrogen sulfide.
C. nitrogen.
D. carbon dioxide.
D. carbon dioxide.
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Which of the following is NOT associated with
a mushroom? a. gill b. dikaryotic hyphae c. nuclear fusion d. meiosis e. flagellated spores
When dividing cells are examined under a light microscope, chromosomes first become visible during
a. interphase. b. the S phase. c. prophase. d. G1. e. G2.
A gene that contains introns can be made shorter (but remain functional) for genetic engineering purposes by using _____
A) a restriction enzyme (endonuclease) to cut the gene into shorter pieces B) reverse transcriptase to reconstruct the gene from its mRNA C) DNA polymerase to reconstruct the gene from its polypeptide product D) DNA ligase to put together fragments of the DNA that code for a particular polypeptide
In order for familial retinoblastoma to appear in the phenotype
A. one new mutation must occur in a normal tumor suppressor gene B. two new mutations must occur in a pair of normal tumor suppressor genes C. one new mutation must occur in a proto-oncogene D. an oncogene must mutate to a tumor suppressor gene