Clonal deletion of developing T lymphocytes takes place in which location(s) in the body?
A. the bone marrow
B. the spleen
C. the liver
D. both the bone marrow and the spleen
E. the thymus
Answer: E
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The following are common to both charophytes and land plants except
A) sporopollenin. B) lignin. C) chlorophyll a. D) cellulose. E) chlorophyll b.
A farmer's land includes a wilderness area that is home to an endangered species of bird. He wants to sell the land to a developer, and you have been hired to evaluate the environmental concerns. "This little patch of land is not crucial for the bird species!" the farmer says, "In fact, my land is surrounded by several other wilderness patches that also have that bird." You reply: "It is possible that your land acts as the ________ and the other areas are ________. If that's the case, development would be devastating to the population."
A. source; sinks B. sink; sources C. metapopulation; population D. population; metapopulation
Provide a brief explanation of the relationship between amino acid sequences in proteins and
nucleotide sequences in DNA and what they can reveal about evolutionary relationships What will be an ideal response?
Hybrids in which the chromosome sets come from two distinct, though related, species are known as
A) autopolyploids. B) allopolyploids. C) aneuploids. D) bivalents.