A 4-year-old boy who is in day care 3 days per week is irritable and scratching the area around his anus. What morphologic characteristics would most likely be observed on microscopic ex-amination of the appropriate specimen?
a. Large eggs, proglottid shape
b. Large eggs with a terminal spine
c. Two individual hooklets
d. Football-shaped eggs with one flattened side
D
The causative agent of pinworm is E. vermicularis. Diagnosis of pinworm infection is usually made on the basis of the recovery of typical eggs, which are described as thick-shelled, foot-ball-shaped eggs with one slightly flattened side. Each egg often contains a fully developed embryo and will be infective within a few hours after being deposited.
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Agricultural crops are being genetically engineered to be more tolerant of climate change. Which of the following describes a change that would help crops be more tolerant of climate change?
A. engineer crops that require extra water B. engineer crops that are less nutritious C. engineer crops to withstand extremely hot temperatures D. engineer crops to be intolerant of colder temperature ranges
The second law of thermodynamics is valid only in a closed system, such as a living organism
Indicate whether the statement is true or false
The internal compartment of the mitochondria is the ________.
Fill in the blank(s) with the appropriate word(s).
The use of a zoo blot to help identify a specific protein-coding gene relies on the fact that
a. DNA fragments shared by many related species are likely to lie in functional exons. b. functional genes are likely to be found in many copies in a single genome. c. functional genes shared by many related species are likely to have the same number of exons. d. functional genes shared by many related species are likely to have introns of similar size. e. DNA fragments shared by many related species are likely to lie in introns of functional genes.