All EXCEPT which of the following events shuffles
existing alleles into different combinations in
sexually reproducing organisms?
a. changes in chromosome number
b. mutation
c. independent assortment of chromosomes
d. crossing over
e. fertilization
Answer: b
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Given that early land plants most likely share a common ancestor with green algae, the earliest land plants were most likely _____
A) nonvascular plants that grew leafless, photosynthetic shoots B) species that did not exhibit alternation of generations C) vascular plants with well-defined root systems D) plants with well-developed leaves
Describe the major biotic and abiotic components of marine ecosystems and how they affect energy and trophic dynamics
What will be an ideal response?
Figure 8.3
Answer the following questions about Griffith's experiments involving Streptococcus pneumoniae.
?
If an injection to the mouse contains live R strain and heat-killed S strain Streptococcus pneumonia, ____.
A. the mouse will live B. the mouse will became fatally ill and live S strain bacteria will be detected in its blood C. the mouse's blood will contain live pathogenic R strain bacteria D. the dead S strain bacteria will transform to live R strain bacteria E. DNA from the live R strain bacteria will revive the dead S strain bacteria
The half-life of carbon-14 is 5,600 years. A fossil that has one-eighth the normal proportion of carbon-14 to carbon-12 is probably
A. 11,200 years old. B. 16,800 years old. C. 5,600 years old. D. 22,400 years old. E. 2,800 years old.