The outermost layer of the digestive tract is the:
A) muscularis externa. B) submucosa.
C) mucosa. D) serosa.
Answer: D
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The economic gap between rich and poor countries has narrowed over the last two decades
Indicate whether this statement is true or false.
Zhang and Cech’s experiments confirmed which feature of ribozyme activity?
a. Ribozymes inhibit rates of biological reactions. b. Ribozymes catalyze formation of bonds between amino acids in protein synthesis. c. Ribozymes catalyze formation of the fundamental linkage tying nucleic acids to proteins. d. Ribozymes can link nucleic acids together even if their proteins are removed. e. Ribozymes provide a possible solution to the question of whether proteins or nucleic acids appeared first in evolution.
A neurologist diagnoses a patient with damage to the hippocampus. This observation is consistent with the difficulties the patient reports with
A. effectively coordinating movements once initiated. B. maintaining a steady and regular heartbeat. C. planning movements. D. forming memories of recent events. E. perceiving tactile stimulation from different regions of their body.
Which of the following correctly represents the probability that a detrimental autosomal recessive
allele will actually be expressed in a population if the occurrence of the allele is such that 1 in 50 individuals are heterozygous? a. 1/50 ? 1/50 = 1/2500, with 1/4 of their children homozygous recessive = 1/2500 ? 1/4 = 1/10,000. b. 1/50 ? 1/4 that are homozygous recessive = 1/200. c. 1/50 ? 2 children (on average) ? 1/4 that are homozygous recessive = 1/100. d. 1/50 ? 2 parents ? 4 children ? 1/4 that are homozygous recessive = 1/25. e. Cannot be determined from the information given.