Which of the following is the main site of photosynthesis in a typical leaf?
A) epidermis
B) endodermis
C) mesophyll
D) xylem
C
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In 1986, a nuclear power accident in Chernobyl, USSR (now Ukraine), led to high radiation levels for miles surrounding the plant. The high levels of radiation caused elevated mutation rates in the surviving organisms, and evolutionary biologists have been
studying rodent populations in the Chernobyl area ever since. Based on your understanding of evolutionary mechanisms, which of the following most likely occurred in the rodent populations following the accident? A) Mutations caused major changes in rodent physiology over time. B) Mutation led to increased genetic variation. C) Mutation caused genetic drift and decreased fitness. D) Mutation caused the fixation of new alleles.
A slimy film discovered on medical equipment turns out to be a colony of complex, previously unknown, single-celled organisms that reproduce asexually and produce energy via organelles resembling chloroplasts. These cells are most likely to be classified as _____.
a. bacteria b. prokaryotes c. eukaryotes d. vertebrates
Birds and mammals are considered polyphyletic when considering that
a. birds have wings and mammals do not. b. birds have feathers and mammals do not. c. birds and mammals do not share the same common reptilian ancestor. d. birds and mammals cannot interbreed. e. molecular clock data indicates birds and mammals diverged at the same time.
When faced with a threat, gopher snakes and bull snakes, who have markings similar to rattlesnakes, will "rattle" their tails in brush to sound like a rattlesnake. In this case, the gopher and bull snakes are mimics, and the rattlesnake is the:
A) predator. B) model. C) commensal. D) prey.