What is the minimum number of aminoacyl-tRNA synthetase enzymes needed to attach amino acids to all the various tRNA molecules?
A. 61
B. 20
C. 64
D. As many as there are different tRNAs.
Answer: B
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Humans first left Africa in a massive migration of roughly 40,000 individuals roughly 60 Kya
a. true b. false
Determining the exact nucleotide sequence of a gene or gene fragment obtained from an unknown organism is based on which of the following methods?
a. Hybridization b. Sequencing c. Amplification (PCR) d. Genotypic
Based on their effects, which pair below would NOT be expected to be active at the same time and place?
A) prostaglandin and nitric oxide B) endocrine and exocrine glands C) hormones and target cells D) neurosecretory cells and neurotransmitters
What is the function of the human NHEJ system? What is the result of mutations of genes in this system?
What will be an ideal response?