In order to construct an evolutionary classification of modern-day aquatic vertebrates, what is the best source of information?
A) the DNA sequence
B) the structure of organs
C) the position of appendages
D) the distribution of scales
A
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The enzyme that adds nucleotide bases to each growing daughter strand in the replication process is called:
a. replication enzymes. b. DNA polymerase. c. insertion sequence enzymes. d. transcriptase.
Of the following combination of statements about protostomes and deuterostomes, which choice is correct?
A. Protostomes are animals in which the mouth develops from the blastopore, and the anus or anal pore develops from the second opening. Deuterostomes are animals in which the anus develops from the blastopore and the mouth develops secondarily later in their development. B. Protostomes are animals in which the anus develops from the blastopore, and the mouth develops from the second opening. Deuterostomes are animals in which the anus develops from the blastopore and the mouth develops secondarily later in their development. C. Protostomes are animals in which the mouth develops from the blastopore, and the anus or anal pore develops from the second opening. Deuterostomes are animals in which the mouth develops from the blastopore and the anus develops secondarily later in their development. D. Protostomes are animals in which the mouth or anus develops from the blastopore, depending on the species. Deuterostomes are animals in which the mouth and anus develops from the blastopore, depending on the species.
Which of the following is NOT a known characteristic of any dinosaurs?
a. bright coloration b. bipedal posture c. feathers d. gills for breathing underwater e. posture with heads upright and tails off the ground
Gram staining divides bacterial species into two groups based on differences in cell wall structure.
Answer the following statement true (T) or false (F)