Which of the following observations were made during Darwin's journey aboard the Beagle that led him to believe in evolution?
A. artificial selection and species variation
B. geological formations and species variations
C. geological formation and the fixation of species
D. All of the above are correct.
Answer: B
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Protein X contains four transmembrane domains, a short N-terminus and a long C-terminus. Following protein synthesis, the N-terminus of the protein faces the lumen (the inside) of the ER. After protein X is transported to the cell surface via exocytosis, you would expect the N-terminus of protein X to be
A. extracellular. B. cytoplasmic. C. in the lumen. D. in the lipid bilayer of the plasma membrane.
AGAMOUS is a gene that has been implicated in the regulation of stamen formation in Arabidopsis flowers. If this is true, a mutant with a functional AP3 gene but a nonfunctional AGAMOUS gene would
A. produce petals but not stamens. B. produce stamens but not petals. C. produce petals and stamens. D. not produce stamens or petals. 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 the evolution of flower development genes? Consider Possibilities · Consider the different answer options. Which can you rule out? 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?
During mitosis, chromosomes are lined up at the equator of the cell during this phase ________.
Fill in the blank(s) with the appropriate word(s).
How would the shape of a DNA molecule change if adenine paired with guanine and cytosine paired with thymine?
A) The DNA molecule would be longer. B) The DNA molecule would be shorter. C) The DNA molecule would be circular. D) The DNA molecule would have irregular widths along its length.