A biologist discovers a new species of organism adapted to living in a deep underground cavern that provides no source of free water. The organism is eyeless and covered by fur, and it has a four chambered heart with a closed circulatory system. What excretory system adaptations to this extreme environment might the biologist expect to find?
A. Very long malpighian tubules
B. Very short malpighian tubules
C. Metanephridia with a large number of nephridiopores
D. Nephrons with long loops of Henle
E. Nephrons with short loops of Henle
D. Nephrons with long loops of Henle
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In studying T cell proliferation (cell division) in response to a specific antigen, you decide to stimulate these T cells with antigen and examine the genes that are activated by the interaction. To do this, following stimulation you should isolate
A) DNA. B) rRNA. C) mRNA. D) tRNA. E) plasmid DNA.
Which tissue lines all internal surfaces and the lining of the gut?
a. epithelial b. loose connective c. supportive connective d. fibrous e. adipose
Anorexia and bulimia ________
A) occur when the body does not receive enough vitamin C B) occur when there is a protein-deficient diet C) occur mainly in affluent countries where thinness is idealized D) occur when a person does not obtain all the essential amino acids
How do deletions and translocations in chromosomes often occur?
A) during meiosis I, sister chromatid exchange leads to abnormalities B) chromosomes will break and the sticky ends will rejoin C) chromosomes will fuse telomere to telomere D) when cells undergo meiosis II, chromosomes naturally break when sister chromatids are being pulled apart E) colchicine treatment causes chromosomal rearrangements