What is true according to the adaptor hypothesis?
A. The anticodon and amino acid have no relationship.
B. A given tRNA can carry any of the twenty amino acids.
C. The position of an amino acid within a polypeptide is determined by the binding of mRNA with a tRNA carrying a specific amino acid
D. An amino acid recognizes the codon in mRNA.
C
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According to the principle of segregation, a heterozygous plant with alleles Aa will produce:
A. gametes with only the A allele. B. gametes with only the a allele. C. 50% of gametes with the A allele and 50% of gametes with the a allele, on average. D. gametes in the ratio of 3 A alleles:1 a allele. E. some gametes with the A allele and some with the a allele, but in no predictable ratio.
Insertion of two bases into the coding region of a gene just after the start codon of a gene will result in
a ____ mutation.
a. missense b. chromosomal c. frameshift d. silent e. nonsense
Which neurotransmitter is responsible for causing muscle contraction?
a. ACh b. ATP c. Calcium d. Potassium e. Sodium
A child has a rash on the face, arms, upper legs, and torso. It is splotchy and intensifies after being in the sun. The child does not complain of fever or itchiness. The signs and symptoms are consistent with
A) chickenpox. B) roseola. C) fifth disease. D) cat scratch disease. E) scabies.