A nonsense mutation in a gene _____
A) changes an amino acid in the encoded protein
B) has no effect on the amino acid sequence of the encoded protein
C) introduces a premature stop codon into the mRNA
D) alters the reading frame of the mRNA
C
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Select the choice that correctly associates the organ with its embryonic sources
A) anterior pituitary gland â€" mesoderm and endoderm B) thyroid gland â€" mesoderm and ectoderm C) adrenal gland â€" ectoderm and mesoderm D) skin â€" endoderm and mesoderm E) brain â€" mesoderm and endoderm
This is a water-soluble hormone derived from the nervous system that regulates blood volume and blood pressure.
A. antidiuretic hormone B. aldosterone C. cortisol D. oxytocin E. adrenocorticotropic hormone
Four of the five enzymes below are used in genetic
engineering. Select the exception. a. ligase b. reverse transcriptase c. restriction d. replicase e. DNA polymerase
The oldest definitive trace of flowering plants in the fossil record consists of:
a. pollen grains in an anther. b. pistils on vegetative stems. c. petals and sepals. d. ovules enclosed in podlike fruits. e. primitive embryo sacs.