Which technique would be used to estimate the concentration of naturally occurring Escherichia coli in a wastewater sample?
A) agar dilution tube method
B) laser tweezers method
C) most probable number (MPN) method
D) cell tagging using GFP method
Answer: C
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In Sanger sequencing, what causes DNA synthesis to terminate at a specific base?
A) Restriction endonucleases cleave DNA after particular bases. B) Fluorescent molecules produce high-energy light that inactivates DNA polymerase. C) Incorporation of a deoxynucleotide that lacks a base causes DNA polymerase to stall. D) Incorporation of a dideoxynucleotide that lacks a 3? hydroxyl. E) Incorporation of a ribonucleotide that lacks a 5' phosphate.
Production of a neurotoxin that prevents acetylcholine release from motor neurons at neuromuscular junctions is a characteristic of ________.
A. Clostridium difficile B. Clostridium botulinum C. Clostridium perfringens D. Clostridium tetani
The tropical rain forest biome is characterized by:
a. high density of plants, but nutrient poor soil. b. high density of plants and nutrient rich soil. c. low density of plants due to nutrient poor soil.
d. low density of plants, yet nutrient rich soil. e. intermediate density of plants and intermediate nutrient supply.
Put the events of the cell cycle into chronological order. Begin at the top with the events of the G1 phase.
a. Cell grows and commits to divide b. Chromosomes are replicated c. Cell makes proteins for chromosome sorting and cell division d. Cell completes mitosis and cytokinesis e. All of these