Interspecific competition occurs between members of the same species
a. true
b. false
Answer: b. false
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There is a population of frogs living in a pond, 25 are green, 25 are brown, 25 are yellow with green spots and 25 are all yellow. A drought occurred and 75% of the frogs died. The remaining frogs were green and brown, after 25 generations the frogs still were green and brown, yellow frogs never appeared in the population again. Which of the following best explains this phenomenon?
A. Sexual selection. B. Balancing selection. C. Bottleneck effect. D. Heterozygote advantage. E. Founder effect.
What is the difference between a dideoxynucleotide (ddNTP) used in sequencing and regular deoxynucleotides?
a. ddNTPs are tagged with radiolabels. b. ddNTPs have 3 extra phosphate groups. c. ddNTPs lack the free 3’ OH group on the five-carbon sugar. d. ddNTPs are bound by hydrogen bonds instead of phosphodiester bonds.
Which of the following is a defining property of all living organisms?
a. Having energy processing abilities b. Showing bilateral symmetry c. Engaging in sexual reproduction d. Adapting at a constant rate
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