What part of the DNA replication process would be most directly affected if a strain of bacteria lacking primase were used to make the cell extracts?
(a) initiation of DNA synthesis
(b) Okazaki fragment synthesis
(c) leading-strand elongation
(d) lagging-strand completion
Choice (a) is the best answer because DNA synthesis cannot begin without the initial primers. Choice (b) is a good answer because lagging-strand synthesis requires continual use of RNA primers for discontinuous replication to occur.
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With one exception, species of the genus Haemophilus require which of the following media ingredients for in vitro growth?
a. Vitamin K and hemin b. Hemin and nicotine adenine dinucleotide (NAD) c. Vitamin K and NAD d. Hemin and cysteine
An example of microbial ________ is the ability of Vampirococcus to attach to the outer membrane of its prey and then secrete degradative enzymes that result in the release of the prey's cytoplasmic contents.
Fill in the blank(s) with the appropriate word(s).
Retired football players are _____ times more likely to die of neurodegenerative brain damage than the general public
a. three b. four c. five d. six e. ten
Establishment of lysogeny by phage is usually influenced strongly by ________.
A. the physiological condition of the host at the time of infection B. the previous host infected by the virus C. components of the host replication machinery D. None of the choices are correct.