单选题Which of the following is the CORRECT explanation of “enzyme” (Para. 6)?AA kind of chemical hormone that is produced by human body.BA kind of protein that act as catalyst in diagnosing lactose.CA kind of fungus that can be used to decompose lactose.DA kind of gene that is called lactase.
单选题
Which of the following is the CORRECT explanation of “enzyme” (Para. 6)?
A
A kind of chemical hormone that is produced by human body.
B
A kind of protein that act as catalyst in diagnosing lactose.
C
A kind of fungus that can be used to decompose lactose.
D
A kind of gene that is called lactase.
参考解析
解析：
由第六段“the enzyme that does so—lactase—stops being produced when the person is between two and five years old.”可知人在2至5岁之间，体内消化乳糖的酶——乳糖酶就停止分泌了。由此可知enzyme是由人体产生的一种激素。
由第六段“the enzyme that does so—lactase—stops being produced when the person is between two and five years old.”可知人在2至5岁之间，体内消化乳糖的酶——乳糖酶就停止分泌了。由此可知enzyme是由人体产生的一种激素。
相关考题：
Which of the following is not correct? （）AIt is useless to complain.BIt is useless complaining.CComplaining is useless.DIt is useless of complaining.
An administrator is adding memory to a server. Once the system boots up, the same amount of memory appears as before the upgrade. Which of the following is the MOST likely cause?（）A、The memory is not the correct CAS latency.B、The memory is not installed in the correct slot.C、The memory does not have the correct timing.D、The memory is not the correct speed.
Which of the following is the correct term for a virtual machine？（）A、 HypervisorB、 Guest OSC、 Virtual CenterD、 Host OS
An administrator has a rack server that is 5.25 inches （13.3 cm） tall， which of the following is the correct U size for this server？（）A、 OneB、 ThreeC、 FourD、 Five
A user states that the wireless on their laptop was working when they where at home, however,now in the office no wireless connection can be made. Which of the following should the technician check FIRST?（）A、If the wireless is enabledB、If the laptop is connected to the correct gatewayC、If the SSID is enabledD、If the DHCP address scheme is correct
An administrator has a rack server that is 3.5 inches （8.9 cm） tall. Which of the following is the correct U size for this server？（）A、OneB、TwoC、ThreeD、Five
A user reports that they are unable to print to a remote printer. Which of the following should the technician check FIRST？（）A、Printer driverB、Protocol stackC、Network connectivityD、Correct patch application
An administrator runs clstat on a cluster node and receives the following response： ’Can not get Cluster Information.’ Which of the following daemons may need to be started in order to correct this problem？（）A、 topsvcsB、 clinfoESC、 snmpinfoD、 clsmuxpdES
A system administrator decides to review the system error log after installing new hardware. Which of the following is the correct command to use？（）A、errptB、syslogC、prtdiagD、errlogger
单选题Which of the following is the correct term for a virtual machine？（）A HypervisorB Guest OSC Virtual CenterD Host OS
单选题An administrator runs clstat on a cluster node and receives the following response： ’Can not get Cluster Information.’ Which of the following daemons may need to be started in order to correct this problem？（）A topsvcsB clinfoESC snmpinfoD clsmuxpdES
单选题An administrator is adding memory to a server. Once the system boots up， the same amount of memory appears as before the upgrade. Which of the following is the MOST likely cause？（）A The memory is not the correct CAS latency.B The memory is not installed in the correct slot.C The memory does not have the correct timing.D The memory is not the correct speed.
单选题A technician needs to upgrade the memory in a laptop. Which of the following memory typeswould be the correct type?（）ARIMMBDDR RAMCSDRAMDSODIMM
单选题Which of the following statements is correct concerning the “flash point ” of a liquid?（）AIt is lower than the ignition temperatureBIt is the temperature at which a substance will spontaneously igniteCIt is the temperature at which a substance, when ignited, will continue to bumDIt is the temperature at which the released vapors will fall within the explosive range
单选题The author of the passage would be most likely to agree with which of the following statements about the Milankovitch theory?AIt is the only possible explanation for the ice ages.BIt is too limited to provide a plausible explanation for the ice ages, despite recent research findings.CIt cannot be tested and confirmed until further research on volcanic activity is done.DIt is one plausible explanation, though not the only one, for the ice ages.EIt is not a plausible explanation for the ice ages, although it has opened up promising possibilities for future research.