Exposure of DNA to UV light from sunlight or tanning lamps can cause _____
1.expansion of trinucleotide repeats associated with degenerative disorders of the nervous system
2.thymine dimers, which interfere with DNA replication and cause cell death, mutation, and cancer
3.generation of free radicals that produce mutations in DNA
4.xeroderma pigmentosum
2
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In a grasshopper, how does ion composition of pre-urine compare to hemolymph?
A) Pre-urine is significantly higher in osmolarity (especially with respect to Na+ and K+). B) Hemolymph is higher in osmolarity, conserving its Cl-. C) Pre-urine is similar to hemolymph in ion composition. D) The protein pumps and channels of the Malpighian tubules concentrate Cl- in the pre-urine.
Connective tissue serves to support and bind other tissues. Which of the following is NOT an example of connective tissue?
A. Bone B. Cartilage C. Neurons D. Fat E. Blood
Chloroplasts in algae are thought to have arisen from which source?
a. Cyanobacteria b. Aerobic bacteria c. Anaerobic bacteria d. Photosynthetic viruses e. Aerobic fungi
Which would you find in the heart of a fish?
A. two atria and one ventricle B. one atrium and one ventricle C. two atria and a partially divided ventricle D. one atrium and two ventricles E. two atria and two ventricles