Which of the following is TRUE of fertilization?
A. It restores the egg to a diploid state.
B. It activates cell division.
C. It is critical to maintaining membrane polarity.
D. It both restores the egg to a diploid state and activates cell division.
E. It both restores the egg to a diploid state and maintains membrane polarity.
D. It both restores the egg to a diploid state and activates cell division.
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High-intensity training in racehorses results in ____
a. the expression of genes involved in energy metabolism, insulin response, and muscle inflammation b. the expression of genes involved in metabolism, oxidative phosphorylation, and muscle structure c. no phenotypic or biochemical changes d. no change in the expression of genes, but changes in phenotypes e. changes in the expression of genes, but no changes in phenotypes
Which of the following perspectives is not a difference between ecosystem management and traditional policies of the past?
A. Humans cannot be separated from nature. B. Scientific knowledge is provisional and as more knowledge is gained, policies change. C. Scientific knowledge is the basis for management since science is free from bias. D. Ecosystem management requires a high level of routine monitoring. E. All of these are perspectives that reflect a difference between ecosystem management and traditional policies of the past.
What is found when alleles among different human groups are analyzed?
A) There are no race-specific alleles and no consistent patterns of allele frequencies within racial groups. B) There are a few race-specific alleles but no consistent patterns of allele frequencies within racial groups. C) There are many race-specific alleles and several consistent patterns of allele frequencies within racial groups. D) There are no race-specific alleles but several consistent patterns of allele frequencies within racial groups.
Why does vomiting often cause a reduction in breathing rate?
a. Reduced breathing occurs to allow PCO2 to rise to aid in the increase in blood bicarbonate. b. Reduced breathing causes an increase in PCO2 which lowers pH toward the setpoint after vomiting causes a loss in acid and rise in blood pH. c. Reduced breathing causes a fall in PCO2 which lowers the pH, moving blood pH toward its homeostatic setpoint. d. Reduced breathing causes a fall in blood PCO2, raising the pH, moving blood pH toward its homeostatic setpoint.