A three-base sequence (loop) in tRNA that is complementary to a three-base sequence in mRNA is
A. a codon
B. an anticodon
C. a promoter
D. a terminator
E. an amino acid attachment site
B. an anticodon
You might also like to view...
An example of natural active immunity would be
A. chickenpox infection, followed by lifelong immunity. B. chickenpox vaccine triggering extended immunity to chickenpox. C. giving a person immune serum globulins to chickenpox virus after exposure to the disease. D. a fetus acquiring maternal IgG to the chickenpox virus across the placenta.
Respond to statements 125–129 in reference to the five
endocrine glands listed below. a. adrenal cortex b. ovary c. pineal d. parathyroid e. thymus D 125. This gland controls circadian rhythms. D 126. This gland plays a central role in the immune response. D 127. This gland secretes a hormone that prepares and maintains the uterus for pregnancy. M 128. Progesterone is produced by this gland. M 129. Calcium concentration in the blood is controlled by this gland.
As intraspecific competition increases, growth and development are affected first, followed by individual survival and reproduction
Indicate whether the statement is true or false
Plasma membranes and some internal membranes have which of the following proteins, which trigger a change in the cell's activities in response to a stimulus?
A. Receptor proteins B. Transport proteins C. Adhesion proteins D. Transmembrane proteins E. Peripheral proteins