What mechanism makes it difficult to classify bacteria into distinct species groups?
A. asexual reproduction.
B. sexual reproduction.
C. vertical evolution.
D. low mutation rates.
E. horizontal gene transfer.
Answer: E
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Zebrafish are a good model organism for vertebrate growth and development because
a. they grow larger than many other fish b. they are at the top of the food chain c. they can regenerate tissues that become damaged such as fins d. they have more offspring than many fish e. they undergo a different form of mitosis than most organisms
Recessive disorders related to genes found on the X chromosome but not on the Y chromosome are more commonly expressed in ________.
A. children B. males C. adults D. females
Which of the following does NOT describe bacterial flagella?
a. smaller and simpler than eukaryotic flagella b. consist of a helical fiber of protein c. found in all motile bacteria d. powered by a gradient of hydrogen ions e. lacks microtubules.
Are "mind reading vs. manipulation" and "costly signaling" mutually exclusive explanations for the evolution of honest signals?
a. Yes, subtle unintentional cues are, by definition, not costly signals. b. No, once a subtle cue becomes a "handle," it could be selected to become a costly signal. c. Yes, by deceiving the receiver with a certain cue, the sender avoids the costs of producing a costly honest signal. d. No, both are cases of antagonistic coevolution.