A protist such as Chlamydomonas may switch to sexual reproduction when:
A) there is little nutrition.
B) hormones from nearby members of the species are detected.
C) there are numerous predators.
D) a 90-day cycle is completed.
Answer: A
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Ernst Mayr defined a biological species as a
A. population, whose members can interbreed. B. group of closely related organisms. C. All of the answer choices are correct. D. group of organisms that live in the same ecosystem, that can interbreed and produce offspring. E. population or group of populations that can interbreed and produce fertile offspring.
One characteristic that makes Caenorhabditis elegans attractive for developmental studies is:
a. its small, transparent body. b. the extensive number of genes shared with humans. c. the developmental defects that occur in this organism. d. the close evolutionary relationship between this mammal and humans. e. the presence of zygotic segmentation genes, similar to those found in humans.
To avoid the introduction of introns into the vector, a ____ copy of mature mRNA is made, using the enzyme ____
a. sDNA; RNA polymerase b. cDNA; DNA ligase c. cDNA; reverse transcriptase d. sDNA; reverse transcriptase e. cDNA; DNA polymerase
Which of the following is not a characteristic of all living things?
A) They contain carbohydrates, proteins, lipids, and nucleic acids. B) They are composed of multiple cells. C) They have adaptive traits. D) They respond to stimuli.