Which of the following statements is INCORRECT regarding prokaryotic cells?
A) Their DNA is not enclosed within a membrane.
B) They lack membrane-enclosed organelles.
C) They typically have a circular chromosome.
D) They reproduce by binary fission.
E) They lack a plasma membrane.
E
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Homo erectus _____
a. was the earliest member of the genus Homo b. was one of the australopiths c. evolved in Africa and dispersed to many regions d. disappeared as the result of an asteroid impact
In mitosis, _____
a. the chromosome number is halved b. the chromosome number is doubled c. the chromosome number stays the same d. the chromosome number may double or be halved depending on the species e. gametes are formed
Heritability can only be measured for
A) traits with phenotypic variance. B) traits with genotypic variance. C) discrete traits. D) polygenic traits. E) None of these
When a jogger starts to run, the rate at which his muscles produce CO2 rises sharply. The CO2 in his blood rises only slightly before he starts to breathe faster and his heart starts beating stronger. Soon his increased rate of CO2 production is balanced by an increased rate of CO2 removal. This would be an example of __________ feedback because the jogger's circulatory and respiratory systems are __________.
a. negative; restoring the CO2 concentration to a set point b. positive; improving the operating conditions in the jogger's body c. positive; decreasing the CO2 concentration d. positive; restoring the CO2 concentration to a set point e. negative; acting in opposition to one another