Fossils indicate that the first cells were similar
to existing
a. viruses.
b. fungi.
c. prokaryotes.
d. eukaryotes.
e. algae.
C
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Endocrine and exocrine glands are derived from what type of tissue?
a. muscle b. nerve c. endocrine d. epithelial e. connective
The amount of time it takes for a radioactive element to decay to 50% of its daughter isotope is called ________
A) decay rate B) half-life C) partial decay D) conversion rate E) quarter-life
Sexual reproduction is important to the survival of a species in a changing environment because
A. sexual reproduction requires less overall energy expenditure than asexual reproduction. B. sexual reproduction produces genetically different individuals. C. sexual reproduction requires only one individual. D. sexual reproduction produces genetically-identical individuals. E. All answers are correct.
Which of the following is TRUE about selective breeding and genetically modified organisms?
GMOs are always superior to selectively bred organisms. Vitamin A genes have been introduced into rice to make these crops resistant to pests. GMO plants are now more common in the world's food supply than wild plants. Desired traits engineered into crops must come from DNA of the same species (e.g. rice genes must always be used to genetically engineer rice). Farmers have been able to produce new varieties of crops by selective breeding alone.