Regarding the experiments that "proved" spontaneous generation, which of the following statements is probably true?
a. Air was lacking.
b. Too much heat was applied.
c. The food source could not support life.
d. Microorganisms were already present.
e. Excess carbon dioxide was present.
Ans: d. Microorganisms were already present.
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Because they are morphologically simple, Psilotophyta (whisk ferns) have traditionally been thought to be a basal group in the radiation of land plants
Molecular phylogenies have challenged this hypothesis and support the alternative hypothesis that they_____. A) are the sister group to the seed plants B) represent a grade rather than a monophyletic group C) have lost complex structures in this lineage D) represent a lineage that forms a monophyletic group with Lycophyta
Irises and other ____ plants flower only when the hours of darkness fall below a critical value, typically in summer
a. short-day b. long-day c. annual d. biennial e. perennial
Taste cells that respond to sour specifically interact with ____
a. sodium ions b. hydrogen ions c. quinine d. sugars e. glutamate
In rabbits, long hair and black fur are produced by the dominant alleles L and B, which assort independently. The genotype ll produces short hair and the genotype bb produces white fur
A cross between a male with short, black fur and a female with long, white fur produces four offspring with short, black fur, four offspring with long, white fur, four offspring with short, white fur, and four offspring with long, black fur. What are the genotypes of the parents? A) llBB × LLbb B) LlBb × LlBb C) llBb × Llbb D) LLBB × llbb E) Impossible to determine from the information given.