Which group in Bacteria lacks cell walls?
A) Corynebacterium
B) Mycoplasma
C) Sporosarcina
D) Tenericutes
Answer: B
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Which of the following statements about nitrogenous waste excretion is correct?
A. Uric acid is less toxic than ammonia, but more energetically costly to produce. B. Ammonia is more toxic than urea, but requires less water for excretion. C. Urea is less toxic than uric acid, but more energetically costly to produce. D. Uric acid is less toxic than urea, but requires more water for excretion. E. Ammonia is less toxic than uric acid, but requires more water for excretion.
Ectomycorrhizae hyphae pass through the walls of the cells in the root cortex
a. True b. False
Okazaki fragments are small pieces of
A) RNA. B) protein. C) DNA. D) enzymes.
To make restriction fragments, a DNA sample is treated with ________
A) DNA ligase B) restriction enzymes C) DNA polymerase D) lysozyme