All of the following statements about a blastocyst are true EXCEPT
a. develops about 5 days after fertilization.
b. still surrounded by the zona pellucida.
c. comprised of blastomeres reorganized around the blastocyst
cavity.
d. still about the size of the original zygote.
e. organized as embryoblast and trophoblast.
Answer: b. still surrounded by the zona pellucida.
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In many animals that have a high cellulose diet but who are not ruminants, the __________
tends to be large.
a. cecum b. stomach c. large intestine d. pancreas
Concentrations of trace elements in an environment above what is required by organisms generally have no effect on those organisms. Which of the following is a valid response to this statement?
a. True. Only trace element limitation can lead to disease among organisms. b. True. Most organisms have evolved adaptations that allow them to tolerate very high concentrations of trace elements in the environment. c. False. Elevated concentrations of some trace elements such as cobalt and chromium can be toxic. d. False. Elevated concentrations of trace elements such as chromium and phosphorus can be toxic. e. False. Increasing the concentration of trace elements above what is required generally has a beneficial effect on organisms.
What is the greatest benefit for carnivores who hunt cooperatively?
A. Greater diversity B. Division of labor C. Defense of territory D. More reproductive options E. Efficiency in catching prey
The replisome has two main subcomponents. They are
A. the replication fork and the sliding clamp subunit. B. the replication fork and the DNA pol III enzymes. C. the DNA pol III enzymes and the sliding clamp subunits. D. the primosome and the sliding clamp subunit. E. the primosome and the DNA pol III enzymes.