Arbuscular mycorrhizae are characterized by all of the following features except
A. They are the most common mycorrhizal type.
B. Fungal hyphae penetrate plant root cells.
C. They are seen in the earliest vascular plant fossils.
D. The fungus can associate with several species of plants.
E. The fungal component is a glomeromycete.
D. The fungus can associate with several species of plants.
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If you were to remove the anthers from a self-incompatible plant, how would this affect the fertilization of its female gametes?
A. Fertilization would continue, as selfincompatible plants rely on pollen from other individuals. B. Fertilization would stop, as selfincompatible plants are fertilized with pollen they produce. C. Fertilization would continue, as selfincompatible plants are fertilized with pollen they produce. D. Fertilization would stop, as selfincompatible plants rely on pollen from other individuals.
__________ can reveal the order of nucleotide bases in a fragment of DNA. Fill in the blank(s) with the appropriate word(s)
A horse has a diploid number (2n) of 64 and a donkey has 2n = 62. The hybrid of these two species, mules, have 2n = 63 and are sterile. Why are mules sterile?
A) Mules cannot physically mate with each other. B) Horses are not able to form new species. C) Mules are not true hybrids. D) One chromosome is unpaired and fails to divide properly during meiosis. E) Mules cannot physically mate with horses and donkeys.
A serum sample from a patient is examined on an electron microscope, and observed to contain Dane particles, filamentous, and spherical virion particles in abundance. This observation indicates infection with
A. human herpesvirus 1. B. EBV. C. hepatitis B. D. hepatitis D. E. VZV.