What is one reason arteries can withstand higher blood pressure than veins?
A) Arteries have one-way valves to prevent blood from flowing backward.
B) Arteries contain all types of blood cells, whereas veins contain only erythrocytes.
C) Arteries have thick walls that contain layers of muscle and connective tissue.
D) Arteries contain only oxygenated blood.
C
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The term "phage" is generally reserved for the viruses that infect
A) animals. B) plants. C) bacteria. D) multiple species.
If molecular techniques predict the phylogeny shown here, which of the following shows the expected order of appearance of species in the fossil record from earliest appearing to most recently appearing?
A. chara, liverworts, hornworts, lycophytes B. chara, lycophytes, liverworts, hornworts C. lycophytes, hornworts, liverworts, chara D. lycophytes, liverworts, hornworts, chara E. hornworts, chara, lycophytes, liverworts
An example of an animal already extinct, as a result of poaching, is the:a
rhino. b. passenger pigeon. c. macaw. d. Carolina parakeet. e. wolf.
Retroviruses have the following characteristics, except
A. reverse transcriptase. B. DNA genome. C. envelope. D. glycoprotein spikes. E. viral genes that integrate into the host genome.