In which situation can a mixture always be called a solution?
A. when one of its components is a gas
B. when there is no solvent in the mixture
C. when its components are made up of different types of particles
D. when the mixture is homogeneous
Answer: D. when the mixture is homogeneous
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Spy hopping is a term given to whales when they:
a. jump out of the water. b. partially get their body out of the water. c. capture their food. d. mate. e. play in groups.
Which of the following best describes processes that take place during cell communication to produce a cellular response?
A) A series of changes takes place in relay molecules through a signal transduction pathway.
B) Local regulators convert electrical signals to chemical signals to cause movement in a cell.
C) Signaling molecules detect changes in a cell's environment and trigger hormone release.
D) Transduction causes signaling molecules to bind to receptors on the surface of a cell.
You cross a true-breeding red-flowered snapdragon with a true-breeding white-flowered snapdragon. All of the F1 are pink. What can you say about the alleles for the parental traits?
A. Both red and white are recessive. B. Red and white show incomplete dominance. C. Pink is dominant, whereas red and white are recessive. D. Red is dominant.
If a cell is in G2:
a. it has twice the amount of DNA present in a telophase nucleus. b. it has visibly distinct chromosomes. c. it lacks a visible nuclear membrane. d. it is in mitosis. e. it is in cytokinesis