Considering the human body as an ecosystem, which of the following statements is incorrect?
A. Microbes act as producers, consumers, and decomposers within the human ecosystem.
B. The human ecosystem lacks an autotrophic niche.
C. The microbiota in the human gut is comprised of heterotrophs.
D. Energy for the human microbiome derives exclusively from the food we eat.
Answer: A
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Rosalind Franklin died from ovarian cancer at the age of 37. Her cancer was probably caused by DNA mutations that
arose from _____.
a. extensive exposure to long wavelength radiation b. contaminated DNA samples c. chemical exposure d. unrepaired DNA replication errors e. extensive exposure to x-rays
Amino acids are linked together by glycosidic bonds to form proteins
1.True 2.False
Which species originated in Africa around 200,000-100,000 years ago?
a. Homo erectus b. Homo habilis c. Australopithecus afarensis d. Homo floresiensis e. Homo sapiens
Nonsense mutations are mutations caused by nucleotide substitutions that change one amino acid into
another. Indicate whether the statement is true or false.