Which of the following statements about root hairs is false?
a. Root hairs increase surface area for absorption of water and mineral ions
b. Root hairs are small when young but will grow into larger roots.
c. Root hairs live only a few days and then are replaced.
d. Root hairs are fragile and only a few millimeters long.
b
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Once organisms are classified as to their domain, there are still millions of different species in each domain. Subdividing them even further makes it easier to understand their relationships to each other. A domain is divided into more subgroups until genus species is reached. Which of the groups listed is the broader group (contains more members)?
A. Order. B. Class. C. Family. D. Phylum. E. Kingdom.
When did the Earth's crust form?
a. 2.9 billion years ago b. 3.2 billion years ago c. 4,600 million years ago d. 4.6 thousand years ago e. 12,000 years ago
Matching. Choose the most appropriate response for
each statement. 1. ___ cladogenesis 2. ___ species 3. ___ isolating mechanism 4. ___ sympatric speciation 5. ___ polyploidy 6. ___ punctuation model 7. ___ mass extinction 8. ___ allopatric speciation 9. ___ adaptive radiation A. geographic separation of two populations accompanied by gradual speciation B. encompasses all of those actually or potentially interbreeding populations that are reproductively isolated from other such groups C. a population occupying the same home range undergoes reproductive isolation D. morphological changes compressed into brief periods followed by speciation E. branching pattern of speciation F. catastrophic, global loss of species G. a burst of microevolutionary activity within a lineage H. inheritance of three or more sets of chromosomes I. prevents gene flow between populations
The UV light affects the nucleotide bases of DNA. What can UV light form, and how many neighbouring bases of DNA become covalently linked in this situation?
a. It can form a primer with two bases linked. b. It can form a dimer with one base linked. c. It can form a trimer with three bases linked. d. It can form a dimer with two bases linked.