Cholera toxin polypeptide A binds to surface gangliosides on target cells. If the gangliosides were removed,
A) polypeptide A would bind to target cells.
B) polypeptide A would enter the cells.
C) polypeptide B would not be able to enter the cells.
D) Vibrio would not produce cholera toxin.
E) Vibrio would bind to target cells.
C
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A student set up an experiment to test if plants give off water vapor. Fifty pea plants, growing in pots, were covered with individual glass containers and left overnight. The next morning, the inside of each lid was covered in droplets of water. The lab student concluded that plants generally give off water vapor. What critique would you make of the experimental design?
A. There was no control so the water could have come from other sources such as air in the jar or the soil. B. There was not a large enough sample of pea plants used to get adequate data. C. The student did not have a clearly stated hypothesis before beginning the experiment. D. The experiment was not precise, meaning it was not reproducible.
Examine the phylogenetic tree depicted in Figure 26.17 as you address the following questions. Extremophiles live in environments with high temperature, low pH, or high salt conditions;
however, hyperthermophiles, acidophiles, and halophiles can also thrive in less extreme environments. A. true B. false
In garden peas, one pair of alleles controls the height of the plant, and a second pair of alleles controls
flower color. The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p). A tall purple crossed with a tall purple produces 3/4 tall purple and 1/4 tall white. What is the genotype of the parents? What will be an ideal response?
Which of the following solutions would be most likely to have the highest water concentration?
hypertonic solution isotonic solution hypotonic solution water concentration and tonicity of a solution cannot be compared