Dynein and the 9+2 array are the primary components of _____.
A) microtubules
B) microfilaments
C) cilia and flagella
D) pseudopodia
Answer: C) cilia and flagella
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If the out-of-Africa hypothesis of human origins is correct, which of the following best describes the pattern of hominin migration from Africa?
A. H. ergaster migrated 2 million years ago; H. sapiens migrated 200,000 years ago. B. H. sapiens migrated once 2 million years ago and again 200,000 years ago. C. H. ergaster migrated once 2 million years ago and again 200,000 years ago. D. H. neanderthalensis migrated once 1.3 million years ago and H. sapiens migrated 200,000 years ago. E. H. heidelbergensis migrated 2 million years ago and H. sapiens migrated 200,000 years ago.
Molecular clocks are usually calibrated based on
A. guesses about the rates of mutations in a particular gene. B. observed rates of mutation in a particular gene. C. the first shared common ancestor for species known from the fossil record. D. comparing the gene to similar genes in other kingdoms. E. the date when two species diverged from a common ancestor.
Concerning diatoms' potential use as drug-delivery systems, which anatomical feature would seem to be most important?
a. their ability to withstand immense pressure b. the chemical composition of their cell walls c. the porous nature of their cell walls d. the chemical composition of their food-storage material e. the nuclear envelope
Which of the following was a biological fact important to the development of Darwin's ideas about evolution?
A. Organisms typically produce huge numbers of offspring. B. There are differences among members of the same species. C. There is a high death rate among organisms. D. All of these are true.