When RNA-dependent RNA polymerase is copying the genome it is functioning as a ________.
A. helicase
B. replicase
C. ligase
D. transcriptase
Answer: B
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Which of the following structures would be the best choice as a biological indicator to test autoclave operations?
A. Endopores formed by Geobacillus (Bacillus) stearothermophilus B. Cysts formed by Azotobacter species C. Microcysts withing the fruiting bodies of myxobacteria D. Dormant spores in the conidia of Streptomyces species
Which process is absolutely necessary for asexual cellular reproduction to occur in eukaryotes?
a. prokaryotic fission b. mitosis c. meiosis d. doubling of chromosomal number in descendent cells e. growth factor activation
A mutant gene that produces brown eyes (bw) is located on chromosome 2 of Drosophila melanogaster, whereas a mutant gene producing bright red eyes, scarlet (st), is located on chromosome 3
Phenotypically, wild-type flies (with dull red eyes), whose mothers had brown eyes and whose fathers had scarlet eyes, were mated. The 800 offspring possessed the following phenotypes: wild type (dull red), white, scarlet (bright red), and brown. Most of the 800 offspring had wild-type eyes, whereas those with white eyes were the least frequent. (a) Using standard symbolism, diagram the cross from the P generation (brown-eyed mothers scarlet-eyed fathers) and the F1 generation. Be certain to provide the alleles of the mutant genes. (b) From the information presented above, how many white-eyed flies would you expect in the F2 generation?
Which of the following is part of the mitotic spindle?
A. sister chromatid B. centromere C. nucleolus D. aster E. nuclear membrane