Which of the following statements about DNA replication is false?
A. Synthesis of both new strands is in the 5' to 3' direction.
B. The newly synthesized DNA is packaged into one nucleus, and the original DNA is packaged into another nucleus.
C. Each existing strand is used as a template for making a new strand.
D. The two strands are separated.
Answer: B
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Fungi reproduce sexually less frequently than asexually. What might be the reason behind this infrequency of sexual reproduction?
A. Sexual reproduction is more energy-intensive than asexual reproduction. B. Sexual reproduction requires two genetically different strains of the fungus to come together. C. In asexual reproduction, one parent divides. D. All statements are true.
Large zooplankton decrease the ecosystem's main productivity when they are abundant
Indicate whether the statement is true or false.
Your friend Joe recently visited the doctor for steroid injections into his knee to reduce swelling due to a previous knee injury. Within a couple of days, he had an infection caused by Pseudomonas, a very pathogenic and drug resistant bacterium. Luckily, Joe went to the doctor immediately and received antibiotics. The doctor tells him that the same problem has occurred to many other people across the United States. Predict the most likely cause of this situation.
A. The needles were re-used and already contaminated before being used on the patients. B. The steroid was contaminated at the production plant, so all batches of that drug made at that plant were contaminated with the bacterium. C. The bacterium is normally on the skin of people, so can easily access the patient's blood during the needle stick. D. The staff giving the steroid injections did not use proper aseptic technique.
Septic shock due to gram-positive bacteria is caused by
a. A-B toxins. b. Lipid A. c. Membrane-disrupting toxins. d. Superantigens. e. Erythrogenic toxin.