The first amino acid of a new polypeptide chain is
a. AUG.
b. cysteine.
c. variable.
d. phenylalanine.
e. methionine.
Answer: e
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Let Y = yellow and y = green, and R = round and r = wrinkled. You cross YYRR peas with yyrr peas. All of the F1 individuals are yellow and round with a genotype of YyRr. You then perform an F2 cross and get the expected 9:3:3:1 phenotypic ratio. What proportion of the F2 plants are expected to be heterozygous for both traits?
Let Cy = curly wings and Cy+ = wild type. In Drosophila, the Cy allele behaves as a dominant mutation that produces curly wings in the heterozygous condition (Cy/Cy+), but also behaves as a recessive lethal mutation. Flies homozygous for the Cy allele die before reaching adulthood. A. 1/16 B. 1/4 C. 1/2 D. 9/16 Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about dihybrid crosses? 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?
It is proposed that Cro-Magnons were responsible for the extinction of many large mammals during the Pleistocene epoch. How could this feat have been accomplished?
A. Cro-Magnon man was the first species of hominids to hunt in groups. This would have increased their chance of killing larger animals. B. Cro-Magnon man was the first species of hominid to use fire. This would have increased their success during hunting. C. Cro-Magnon man was the most efficient bipedal species. They would have been able to run after prey species more efficiently than any of their predecessors. D. Cro-Magnon man had an increase in tool technology that enabled them to kill animals from a distance.
Exclusive male parental care is much more prevalent in fish than in mammals because:
a. both male and female fish lactate. b. fish do not have the option of raising young in a defended nest site or den. c. fish are less intelligent and so do not develop pair bonds. d. most fish reproduce by external fertilization while most mammals do not. e. fish are less likely to live in habitats with high-quality resources.
Sucrose is formed
A) from two glucose molecules. B) from two monosaccharides through dehydration reactions. C) when ionic bonds link two monosaccharides. D) when glucose and lactose are combined.