In the Sierra Nevada Mountains of California there are many populations of the checkerspot butterfly Euphydryas editha. You notice that females of one population lay their eggs near the tip of a plant's stem (population A)
Females of another population in the same area lay
their eggs at the base of the stem on a different type of plant (population B). The young
hatch out as caterpillars; they live on the host plant and eat its leaves.
Is the information above a complete description of the butterflies' niche?
A. Yes, because I know the butterflies live in
the Sierra Nevada.
B. Yes, because both eggs and adults are
described above.
C. Yes, because eggs, young, and adults are
described above.
D. No, because I also need to know what the
adults eat.
E. No, because a complete niche includes
physical and biological factors.
E
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In a two-point test-cross analysis, a dihybrid F1 fly is crossed to a __________
A) pure-breeding mate with a dominant phenotype (AABB) B) pure-breeding mate with a recessive phenotype (aabb) C) heterozygote mate (AaBb) D) mate that is dominant for one gene and recessive for the other (AAbb or aaBB) E) second dihybrid F1 fly (sibling cross)
Which of the tools below is used to cut the gene from its normal location?
A. restriction enzyme B. plasmid C. bacteriophage D. vector
This is another class of intermediate filaments found in epithelial cells:
A. keratin B. myosin C. tubulin D. amino acids E. actin
In what ways are mitosis and meiosis similar?
A) each sorts duplicated chromosomes into daughter cells B) each forms a bipolar spindle C) enzymes that repair DNA damage are critical to both processes D) all of the choices