You are given a newly discovered organism and are asked to help classify it. You note only one opening to the digestive tract, and microscopic examination shows it to be multicellular and lacks chloroplasts. You therefore call it
A. heterotrophic, with an incomplete digestive tract.
B. autotrophic, with an incomplete digestive tract.
C. heterotrophic, with a complete digestive tract.
D. autotrophic, with a complete digestive tract.
E. None of the answer choices is correct.
A. heterotrophic, with an incomplete digestive tract.
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The table shows the distribution of traits (A-E) in six extant species (1-6). A "0" indicates the ancestral condition, and a "1" indicates the derived condition. Which trait is least informative of phylogenetic relationships within the group?
A. A
B. B
C. C
D. D
E. E
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 cladistics?
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?
Imagine a cell entered mitosis but was unable to make microtubules. At what stage of mitosis would it remain? What will be an ideal response?
As cells enter mitosis, their microtubules disassemble and then reassemble forming the mitotic spindle with a focus at the ________, a special animal cell microtubule-organizing structure.
a) kinetochore b) centromere c) centrosome d) kinetosome e) chromosome
It is possible for a repressor to negatively regulate the expression of an operon because:
A. the repressor-binding site on the DNA overlaps with the translation start site, thereby preventing the transcription. B. the repressor physically blocks where the activator should be binding on the operator region. C. one of the structural genes expressed in the operon negatively regulates the repressor. D. the repressor-binding site overlaps the promoter site of the operon, allowing it to physically block the binding of RNA polymerase. E. the repressor induces the expression of the inducer by binding to the promoter that comes before the inducer gene.