The genus Mycobacterium ________.
A. have cell walls similar to Gram-negative bacteria
B. stain acid-fast
C. are strict anaerobes and catalase positive and have cell walls similar to Gram-negative bacteria
D. are strict anaerobes and catalase positive
Answer: B
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The 13C/12C isotopic ratio of geological rocks of different ages has been used as evidence for or against past biological activity, because compounds of biological origin
A) do NOT contain 13C. B) have a higher proportion of 13C that compounds of geological origin. C) have a lower proportion of 13C that compounds of geological origin. D) are not well preserved in geological samples.
Rubisco has 16 subunits joined together to make a functional unit. Eight of the subunits are large, the other 8 are
small. What is the function of the small subunits?
a. The small subunits contain the reactant binding sites. b. They stabilize the overall enzyme's structure but have no intrinsic function. c. The function of the small subunits is still unknown. d. They regulate the enzyme's rate of catalysis. e. The small subunits contain allosteric regulator binding sites.
A ________ estuary has sharp boundaries between saltwater and freshwater
a. well-mixed b. partially mixed c. salt wedge d. fjord
Why are pea plants (Pisum sativum) a good species for genetics studies?
A. They have many distinctly identifiable forms of genetic traits.
B. They can be self-fertilized for true-breeding genetic traits.
C. They produce large numbers of offspring (the peas).
D. All of the answer choices are correct.
E. Growth of pea plants is simple and easy.