Organisms that are resident microbiota are best described as
A. microorganisms that remain with the person throughout life.
B. any microorganisms that cause disease.
C. organisms that are present in or on the body for a short time without causing harm.
D. microorganisms that may cause a disease under certain circumstances.
E. microorganisms that never cause disease.
Answer: A
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Which of the following is NOT true of the
human embryonic heart?
a. before developing four chambers, it resembled a fish heart b. before developing four chambers, it had three chambers like an amphibian c. it begins beating around the third week d. all of these (a through c) are NOT true of the human embryonic heart e. all of these (a through c) are true of the human embryonic heart
Arbuscular mycorrhizal fungi invade plant roots, with many species forming mutualistic associations that benefit both the fungus and the plant.
Answer the following statement true (T) or false (F)
A narrow hybrid zone separates the toad species Bombina bombina and Bombina variegata. What is true of those alleles that are unique to the parental species?
A) Such alleles should be absent. B) Their allele frequency should be nearly the same as the allele frequencies in toad populations distant from the hybrid zone. C) The alleles' heterozygosity should be higher among the hybrid toads than in toad populations distant from the hybrid zone. D) Their allele frequency on one edge of the hybrid zone should roughly equal their frequency on the opposite edge of the hybrid zone.
The major product of the Calvin Cycle is
a. rubisco b. oxaloacetate c. RuBP d. pyruvate e. glyceraldehyde - 3- phosphate