To prevent the souring of crude oil, ________ is added to oil well injection water to encourage ________ instead of ________
A) oxygen / aerobic respiration / sulfate reduction
B) sulfate / sulfate reduction / fermentation
C) sulfate / sulfate reduction / nitrate reduction
D) nitrate / nitrate reduction / sulfate reduction
Answer: D
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Which is not one of the four atoms that make up the bulk of living organisms?
A. Calcium B. Carbon C. Nitrogen D. Oxygen
Answer the following statements true (T) or false (F)
1. Genes that are expressed only when needed are called constitutive genes. 2. Polysaccharides, polypeptides, and nucleic acids are all examples of polymers. 3. During translation, amino acids are “activated” by attaching to an appropriate rRNA molecule. 4. The peptide bonds that hold amino acids together in protein molecules are examples of covalent bonds. 5. In double-stranded DNA molecules, the two strands are held together by hydrogen bonds.
What do mitochondria and chloroplasts have in common?
a. both are found in plants cells b. both contain chlorophyll c. DNA is present in both d. ribosomes are present in both e. both are found in plants cells, and DNA and ribosomes are present in both
In humans, the sex of an offspring is determined solely by the chromosomes donated by the male parent
Answer the following statement(s) true (T) or false (F)