A mixture of DNA fragments is amplified from a sample of ocean water. Which gene(s) could be definitively categorized as originating from a species of animal?
A. Genes for ATP synthase
B. Genes for RuBisCO
C. Gene for Spongin
D. Cell cycle regulatory genes
E. Genes for biosynthesis of chitin
Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
Gather Content
· What do you already know about animal genes?
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?
C. Gene for Spongin
Clarify Question
· What is the key concept addressed by the question?
o This question addresses animal genes.
· What type of thinking is required?
o This question is asking you to take what you already know and apply it to this unfamiliar situation.
Gather Content
· What do you already know about animal genes?
o Some of the genes listed are expressed in animals, some are not. Only one is expressed in animals but not other organisms.
o ATP synthase – This enzyme synthesizes ATP, which is used by many organisms. Not unique to animals.
o RuBisCO – This enzyme plays a role in carbon fixation by plants. Not in animals.
o Cell cycle regulatory genes – All multicellular organisms have to regulate their cell cycle. Not unique to animals.
o Genes for biosynthesis of chitin – Chitin is a polysaccharide found in arthropods and mollusks, but also in fungi and algae. Chitin is not unique to animals.
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
o Spongin is the tough protein in mesohyl that provides strength to the body of sponges. Since a sponge is an animal, this gene originated from an animal.
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?
o The question required you to take what you already know and apply it to this unfamiliar situation.
o Did you recognize that spongin is a protein in sponges, which are a type of animal?
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When we say that DNA replication is semiconservative, we mean that:
A. only half of an organism's DNA is replicated during each cell division. B. when DNA is replicated, each new double helix contains one parental strand and one newly synthesized daughter strand. C. when DNA is replicated, one double helix contains both parental strands and one contains two newly synthesized daughter strands. D. parental DNA stays in the parent cell and daughter DNA ends up in the daughter cell. E. None of the answer options are correct.
Male peacocks have tail feathers that make up about 60% of their body length. During the mating season they contract muscles to shake these feathers in front of females; females evaluate the feather rustling as part of selecting their mate
The __________ is the mechanistic cause of this behavior; the ___________ is the adaptive function of this behavior. A. mate choice; ability to shake the tail B. ability to shake the tail; mate choice C. female evaluation of the behavior; ability to shake the tail D. ability to shake the tail; female evaluation of the behavior
When conducting descriptive research, a scientist primarily uses ____
a. experiments b. experimental data c. control data d. observational data e. speculation
At low population density, __________ is favored, quickly producing as many offspring as possible.
Fill in the blank(s) with the appropriate word(s).