Which of the following elements is directly
obtained by plants from the atmosphere?
a. nitrogen
b. hydrogen
c. carbon
d. phosphorous
e. sulfur
C
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Which of the following does NOT describe modern, living cells?
a. a semi-permeable membrane keeping the internal environment of the cell separate from the external environment b. nucleic acids linked in a sequence to form at least one large molecule c. a requirement for the nucleic acids to be contained behind a nuclear membrane d. multiple pathways for converting energy from one form into another e. a method of converting the nucleic acid sequences into proteins
In translation, unlike DNA replication, the base-pairing rule is not required Indicate whether the statement is true or false
Assume that the shaded portions of the molecule in the accompanying figure each represent different polypeptide
chains. What does this represent?
a. cellulose
b. a carotenoid
c. an amino acid
d. a steroid hormone
e. the quaternary structure of a protein
Several cases of an emerging infectious disease are reported in workers at a research station that borders a tropical rainforest region. The pathogen is identified as a species of bacteria carried by nematodes that infect mosquitos, and disease transmission occurs in a human host following a mosquito bite. Which organisms should be targeted in the treatment of infected patients?
A. Mosquito and nematode B. Mosquito and bacteria C. Nematode and bacteria D. Mosquito, nematode, and bacteria