While going for an autumn hike in the forest, you see some trees with green leaves and others with red, yellow, and orange colored leaves. What explains the difference in the leaf color in autumn?
What will be an ideal response?
Plants that change color during autumn are preparing for a period of dormancy. They conserve resources by moving nutrients from tender parts of the plant such as the leaves, to protected parts. The green chlorophyll pigments are disassembled and recycled faster than yellow and orange accessory pigments. In the summer, chlorophyll pigments are more abundant than other pigments and therefore mask the colors of the other pigments. Therefore, the leaves contain different pigments during the other seasons but once the chlorophyll pigments begin to be disassembled in autumn, the other pigments become visible.
(The red coloring also becomes apparent in the fall because anthocyanin synthesis increases in the fall).
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Which of the following will help you distinguish between the two final suspects?
You are a forensic technician working on a DNA sample obtained from a crime scene. Your job is to compare the unknown DNA sample with known DNA samples collected from five different suspects. Preliminary analysis using only a few DNA markers revealed that the unknown sample could possibly match two of the suspects. After consulting the case file, you find out that these two suspects are brothers (but not twins). You realize that you will have to do a more detailed analysis on the samples so that you can distinguish between the brothers and determine which brothers' DNA matches the unknown sample. A. single nucleotide polymorphisms (SNPs) B. human genome map C. linkage data D. markers on the Y chromosome 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 genetic maps and DNA markers? 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?
The tooth morphology of an animal is related to its diet
a. True b. False
Rats learning to press a lever to receive food is an example of
A. habituation. B. operant conditioning. C. classical conditioning. D. negative reinforcement. E. avoidance.
Which of the following is related to an increase in the chance of breast cancer?
A) breast-feeding B) early first menstruation C) early menopause D) pregnancy