Which of these trends occurred first in hominid evolution?
A) large brain
B) bipedalism
C) tool use
D) writing
B
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An orbital describes the ____ of an electron
a. exact location b. exact path c. most frequent locations d. charge e. chemical bonds
Mutations in the lacI and lacO genes of the lac regulatory system in E. coli often lead to full transcription of the three structural genes, even when no lactose is available to the organism. Such mutations would be called ________
Fill in the blank(s) with correct word
Drugs known as beta-lactams interfere with bacterial (DNA/folic acid/cell wall) synthesis
What will be an ideal response?
When cells are placed in hypotonic solutions, both animal and plant cells accumulate water as a result of osmosis. This causes the cells to swell. Why can plant cells better tolerate hypotonic solutions?
A. Animal cells can burst in such situations. But in plants, rigid cell walls limit how far cells can expand and exert a back pressure to limit further water uptake. B. Plants have contractile vacuoles that continually bail out excess water that enters plant cells. C. Sunlight causes plant cells to lose water through transpiration. D. Stomata in plant cell leaves quickly drain excess water from the cells.