Hemophilia is caused by an X-linked recessive gene. A normal woman whose father had hemophilia
marries a normal man. What are the chances of hemophilia in their children? What will be an ideal response?
All females normal but 1/2 of them would be carriers; 1/2 of the males would have hemophilia, the
other 1/2 normal.
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Assume that a newly developed chemical agent blocks the active site of the enzyme shown in the figure. This drug must be similar in shape and size to
A) glucose. B) fructose. C) sucrase. D) sucrose.
Why might Candida albicans become pathogenic in an individual receiving antibacterial medications?
A. This fungal organism can actually utilize the destroyed bacterial cells as a nutrient source and begin to multiply out of control. This can cause a pathogenic state. B. This is an opportunistic pathogen not normally found in normal microbiota. As such, when the bacterial normal microbiota is wiped out by broad-spectrum antibacterial drugs, this opportunist can adhere to and colonize the area left behind. C. This is a usual member of the normal microbiota. However, when the bacterial members of the normal microbiota are wiped out by a broad-spectrum antibacterial drug, this fungal cell type has little to no competition for resources in the affected area. As such, it quickly overgrows and can cause a pathogenic state. D. This is a protozoan species and part of the normal microbiota. When the bacterial members of the normal microbiota are wiped out by a broad-spectrum antibacterial drug, this protozoan cell type has little to no competition for resources in the affected area. As such, it quickly overgrows and can cause a pathogenic state.
Plasmids are ____
a. enzymes that cut DNA b. RNA molecules c. small proteins that help replicate cloned genes d. protein-coding genes in the chromosome e. circular DNA molecules that replicate separately from chromosomal DNA
Roots, used for anchoring the plant in soil and enhancing absorption of soil water and nutrients, evolved in the seedless vascular plant phylum ________.
A. Hepatophyta B. Monilophyta C. Bryophyta D. Lucophyta E. Anthocerophyta