A fungal infection found mostly in the tropics and temperate regions is characterized by the development of soft, yellow or pale-brown aggregations around hair shafts in the axillary, facial, genital, and scalp regions. The fungus that would most likely be isolated is:
a. Candida.
b. Malassezia.
c. Cryptococcus.
d. Trichosporon.
D
White piedra caused by Trichosporon spp. is an uncommon fungal infection in patients who are immunocompetent and is found in both tropical and temperate regions of the world. It is charac-terized by the development of soft, yellow or pale-brown aggregations around hair shafts in the axillary, facial, genital, and scalp regions of the body. The Trichosporon spp. that causes this disease frequently invades the cortex of the hair and causes damage.
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Some traits are polygenic but do not show typical continuous distributions. For example, type II diabetes is determined by a number of genes, but one is either diagnosed as diabetic or not diabetic based on blood sugar levels
How might one explain such a phenomenon?
A mutation in the promotor region of a gene can result in cancer. Which of these scenarios results in cancer?
a. The mutation is in the promoter region for an enzyme that metabolizes starch, such as amylase. Starch digestion is disrupted. b. The mutation is in the promoter region for a protein that controls rebuilding of the telomeres. As a result, these cells die prematurely. c. The mutation is in the promoter region for a protein that controls a key gate-keeper in the cell cycle. Without the gate-keeper, the cell blows through that checkpoint and continues with growth, unchecked. d. The mutation is in the promoter region for a calcium channel in the cell membrane of bone cells. The result of the mutation is a buildup of excess calcium in the extracellular space.
A protein region with a specific function and structure is called a
A) conserved site. B) domain. C) locale. D) motif.
Which of the following questions is about gene regulation? Select all correct choices
A. Why do all eukaryotes share a common genetic code? B. Where are genes for hemoglobin expressed? C. How much insulin is produced after a meal?