Which one of the following statements about horizontal gene transfer is false?
A. Horizontal gene transfer involves hitchhiking genes from other species.
B. Horizontal gene transfer is also called lateral gene transfer.
C. Horizontal gene transfer was common early in life, but is absent today.
D. Gene swapping is evident in the human genome.
E. The products of horizontal gene transfer often exist as transposons.
Answer: C
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If one homogenizes liver cells, separates the membranes from the cytoplasm, and then adds epinephrine to only the cytoplasmic portion,
A) cAMP will be produced. B) G-proteins will be activated. C) adenylyl cyclase will be activated. D) calcium ions will be released. E) none of the above
In Cell 2,
Consider the following plant cells floating in an open beaker containing 0.2M sucrose. By definition, an open beaker has a pressure potential 0 MPa. Assume that the cells have come to equilibrium with the solution in the beaker.
A. ?p = 0.75 MPa and ?w = 0.0 MPa.
B. ?p = 0.0 MPa and ?w = -0.75 MPa.
C. ?p = -0.25 MPa and ?w = -0.5 MPa.
D. ?p = +0.25 MPa and ?w = -0.5 MPa.
E. ?p = +0.25 MPa and ?w = +0.25 MPa.
Clarify Question
What is the key concept addressed by the question?
What type of thinking is required?
What key words does the question contain and what do they mean?
Gather Content
What do you already know about water potential? How does it relate to the question?
Consider Possibilities
What other information is related to the question? Which information is most useful?
Choose Answer
Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
How many cells are produced from a single cell after five mitotic divisions?
a. 8 b. 10 c. 16 d. 32
While looking under a microscope, you see two neighboring daughter cells. One of the cells contains three chromosomes, and the other contains five. The parent cell normally contains four chromosomes. What could be the reason for the different number of
chromosomes in the cells? A) Replication of DNA did not occur properly. B) The nuclear envelope did not dissolve, so mitosis could not occur at all. C) The division of sister chromatids of one chromosome did not occur properly during mitosis. D) The division of homologous chromosomes during meiosis II did not occur properly.