Keratins are structural proteins in skin, hair, and fingernails. One gene, called KRT10, is located on the 17th paired chromosome in humans. It produces a keratin that strengthens skin cells. Researchers isolated the specific location on the DNA having the nucleotide sequence, accessed during transcription, that encodes for the mRNA strand that will direct translation of the proteins. That specific portion of the DNA is the
A. parent strand.
B. codon strand.
C. template strand.
D. lagging strand.
E. leading strand.
C. template strand.
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This type of RNA is typically found as a strand about 75?90 bases long that folds into a structure with
four double-helical segments.
a. snRNA b. pre-mRNA c. rRNA d. tRNA e. mRNA
Which statement is true?
a. Antibodies are bound to plasma cells. b. Antibody neutralization kills cells that have already been infected. c. Temporary immunity can be transferred between individuals. d. Complement activation occurs within neutrophils.
According to the above figure, which letter corresponds to the area where amino acids are most likely to be reabsorbed?
A. A
B. B
C. C
D. D
E. E
In both plants and animals, the vascular system
transports a. water. b. nutrients. c. chemical signaling molecules. d. defensive molecules. e. all of these.