Why is the continual use of the antibacterial triclosan in soaps a potential health risk?
A. Bacteria could evolve a resistance to commonly used antibiotics.
B. Triclosan is lethal to mammals at low concentrations.
C. Antibacterial soaps are often contaminated with viruses.
D. The use of soap is ineffective at stopping the spread of disease.
Answer: A. Bacteria could evolve a resistance to commonly used antibiotics.
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The minimum bactericidal concentration is the lowest concentration of a specific antimicrobial drug that kills _______ of a specific type of bacteria
A. 10% B. 50% C. 99.9% D. 100%
An autosome is a ____
a. chromosome other than a sex chromosome b. structure used to transport genetic material to the cytoplasm c. chromosome containing a group of genes involved in autoimmune disorders d. region of the DNA that is self-replicating e. cellular body involved in autoimmune disorders
Examples of "new" features, which include wings on insects, flowers on plants, and feathers on birds,
are referred to as: a. preadaptations. b. allometric growth. c. allopolyploidy. d. paedomorphosis. e. punctuated equilibrium.
You've likely heard of polar bears (Ursus maritimus) and grizzly bears (Ursus arctos horribilis). Have you hear of a grolar bear or a pizzly bear? These might be unfamiliar because they are the offspring of matings between polar bears and grizzlies
A handful of these animals have been born in zoos; three have been documented in nature. Due to their rarity, only a few grolars (grizzly dad and polar bear mom) or pizzlys (polar bear dad and grizzly mom) have been studied in detail. Their fur color, head shape, and ear shape are striking intermediates between the phenotypes of their parents. It is thought that polar bears originated from a population of brown bears (Ursus arctos) that became geographically isolated during a glaciation event that occurred about 150,000 years ago (Lindqvist et al., 2010). Traditionally the territories of grizzly bears and polar bears did not overlap, as grizzlies ranged from Alaska to Mexico, whereas polar bears stayed on the annual sea ice over the Arctic continental shelf and within the Arctic archipelagos. Relatively recently (last 50 years or so) grizzlies and polar bears have begun to come in contact in the wild. References: Lindqvist, Charlotte; Schuster, Stephan C.; Sun, Yazhou; Talbot, Sandra L.; Qi, Ji; Ratan, Aakrosh; Tomsho, Lynn P.; Kasson, Lindsay et al. (2010). Complete mitochondrial genome of a Pleistocene jawbone unveils the origin of polar bear. PNAS 107 (11): 5053-5057. doi:10.1073/pnas.0914266107. PMC 2814953. PMID 20194737. The origin of polar bears was the result of A. allopatric speciation. B. sympatric speciation. C. peripatric speciation.