Which of the following gases was not present in the Earth's early atmosphere but appeared after the
evolution of certain organisms?
a. hydrogen
b. methane
c. nitrogen
d. oxygen
e. carbon dioxide
D
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You are examining the effect of maturation-promoting factor (MPF) in sea urchin cells, which have a diploid number of 36. If you fuse a dividing sea urchin cell with a G1 arrested oocyte, what would be the outcome?
A. The G1 cell would enter mitosis, but would likely arrest at the spindle checkpoint because the chromosomes have not been properly replicated. B. The G1 cell would undergo mitosis and its daughter cells would each have 36 chromosomes. C. The G1 cell would undergo mitosis and its daughter cells would each have 18 chromosomes. D. The G1 cell would first go through S phase and then mitosis. Its daughter cells would have 36 chromosomes. 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 know about MPF? 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?
Actin is a structural subunit of
a. myosin. b. microtubules. c. intermediate filaments. d. microfilaments. e. all of these.
A karyotype
a. compares one set of chromosomes to another. b. is a visual display of chromosomes arranged according to size. c. is a photograph of cells undergoing mitosis during anaphase. d. of a normal human cell shows 48 chromosomes. e. cannot be used to identify individual chromosomes beyond the fact that two chromosomes are homologues.
Infections with Legionella pneumophila are usually transmitted via aerosols from contaminated air conditioning systems, showers, and humidifiers
Indicate whether the statement is true or false