When methanogens convert carbon dioxide to methane, it is a(n) ________ reaction.
A. aerobic
B. oxidation
C. ammonification
D. reduction
Answer: D
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The cell wall of plants is composed primarily of cellulose, which is a network of highly branched ____
a. carbohydrates b. nucleic acids c. proteins d. steroids e. phospholipids
The poly(A) tail of an mRNA ____
a. is where the start codon is located b. covers the stop codon until it is needed c. protects the mRNA from attack by RNA-digesting enzymes d. is where ribosomes attach at the start of translation e. is where translation terminates
DNA barcoding:
A: is a type of reverse genetics. B: is the most commonly used type of DNA fingerprinting used by the FBI. C: attempts to provide a unique sequence identifier for all life forms. D: is based mainly on repetitive DNA. E: is used for prenatal genetic screening.
Based on the information given, which of the organisms described below most likely has the lowest fitness?
a) a sand-colored mouse living at the beach b) a sterile organism that lives twice as long as the average longevity in its population c) a dark-colored mouse living in the brown brush d) a short-lived rabbit with a greater than average number of offspring, relative to other individuals in its population e) a human who dies at age 40 who has had four children