When Gregor Mendel first started his genetics experiments, he ____
a. knew about the existence of genes
b. knew that some plants "breed true"
c. knew that genes were responsible for observable traits
d. allowed the pea plants to self-fertilize
e. expected all true breeding crosses to produce offspring with intermediate phenotypes
ANSWER: b
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The beads-on-a-string form of DNA condenses into a compact fiber called the 30 nm filament. Which of the following is true about its formation?
A. Histone H1 is essential for formation of the 30 nm filament. B. The histone tails of the octamer histones are absolutely required for filament formation. C. The zigzag model describes how the nucleosome array adopts a spiral shape when forming the filament. D. The 30 nm filament is also called a tetranucleosome. E. The linker histone is essential for formation of the 30 nm filament.
In small aquatic animals, such as hydra and planarians, the most common structure used for gas exchange is the
A. cardiovascular system. B. body surface. C. gills. D. lungs.
A male fruit fly carries the allele for yellow body color on his X chromosome. How would this male's genotype for this body color gene be described?
A. heterozygous B. homogametic C. holandric D. hemizygous E. homozygous
Which statement about nematodes is most accurate?
A) They are mainly crop pests. B) They are mainly parasites. C) They all have straight, flattened bodies. D) They have exoskeletons made of cellulose. E) They fit into numerous ecological roles including detritivores.