Following an endospore stain, how does one distinguish endospores from vegetative cells?
a. Vegetative cells are pink, endospores are green.
b. Vegetative cells are pink, endospores are purple.
c. Vegetative cells are purple, endospores are pink.
d. Vegetative cells are green, endospores are pink.
Ans: a. Vegetative cells are pink, endospores are green.
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Which of the following statements is correct regarding chromosomes in a eukaryotic cell?
A. Chromosomes are strands of RNA, tightly wrapped up, that are in the cytoplasm. B. Chromosomes are strands of DNA, tightly wrapped up, that are located in the nucleus. C. Chromosomes are strands of RNA, loosely wrapped up, that are located everywhere in the cell. D. Chromosomes are strands of DNA, tightly wrapped up, that are located everywhere in the cell.
What characteristic of carrier female 2 from generation III predisposed her to produce fragile X offspring at a higher proportion than did her grandmother, the carrier female of generation I?
1.random chance
2.female I-2 was phenotypically normal but her granddaughter, female III-2, was not
3.permutation alleles transmitted by males tend to remain stable or decrease while those transmitted by females become fully mutant alleles
4.permutation alleles transmitted by females tend to remain stable or decrease while those transmitted by males become fully mutant alleles
Despite some evidence that antibiotic resistance can confer a fitness disadvantage to bacteria in nonantibiotic environments as compared to susceptible strains, research has also documented that ________
A) compensatory evolution by way of mutation events in other genes may very well make antibiotic resistant strains as fit, or even more fit, than sensitive strains B) an energy balance trade-off outweighs the advantages that antibiotic sensitive strains have otherwise C) strains sensitive to antibiotics will readily and spontaneously mutate at will to achieve antibiotic resistance, even in the absence of antibiotics D) None of the above.
A very large gene, such as DMD, may take hours to transcribe mainly because
a. RNA polymerase may have difficulty clearing the promoter. b. long mRNAs form secondary structures that interfere with transcription. c. RNA polymerase has time-consuming error correction activity. d. many histone octamers may need to be modified or disassembled. e. there may be multiple abortive attempts at transcription.