Which existing reptile group is most closely related to birds?
a. crocodilians
b. lizards
c. snakes
d. tuataras
e. turtles
a
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A polymerase chain reaction (PCR) copies an individual gene segment in vitro with a(n) ________ primer(s)
A) individual RNA B) individual DNA C) pair of RNA D) pair of DNA
The DNA sequence 5? ATGGGGGACACC 3? encodes the amino acids Met Gly Asp Thr. A mutation changes the sequence to 5? ATGGGGAACACC 3? that encodes the amino acids Met Gly Asn Thr. What type of mutation has occurred?
A) frameshift mutation B) missense mutation C) silent mutation D) nonsense mutation
A layer of endodermal cells around the cylinder deposit a waterproof band called a __________ in
their abutting walls. Fill in the blank(s) with the appropriate word(s).
How many different amino acids are present in the human body to produce the infinite variety of enzymes and other necessary proteins?
A) 10 B) 20 C) millions D) an infinite variety