A chemical that delivers amino acids one at a time in the ordered sequence specified by the mRNA strand is called ________
A) mRNA B) DNA C) tRNA D) rRNA
Answer: C
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A male cricket creates sounds that we call "chirps" by rubbing one wing against the other. When is this considered an act of communication?
A. Every time the cricket produces a chirp regardless of whether the signal is received by an organism. B. Every time a member of its own species hears a chirp regardless of its response to the signal. C. Every time a female member of its species hears a chirp and changes her behavior in response to the signal. D. Every time the chirp is heard by some other organism that changes its behavior in response to the signal.
Which of the following contribute to the environmental resistance of bacterial endospores?
A. Presence of calcium dipicolinate B. Spore coat C. Low water content of endospore D. Lower pH E. All of the choices are correct.
To move, an animal must expend ____ to overcome the effects of ____ and friction
a. oxygen; respiration b. muscle contractions; fatigue c. nutrients; motion d. glucose; movement e. energy; gravity
When comparing the gene coding for cytochrome c in several species, it was noted that humans and chimpanzees
share the identical amino acid sequence. This means that ____. a. humans and chimpanzees can mate and produce viable offspring b. humans evolved from chimpanzees c. over time, chimpanzees will eventually evolve into primitive humans d. humans and chimpanzees are closely related in evolutionary time e. chimpanzees will eventually evolve to become human