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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology