Which of the following is true of diabetes mellitus type 1?
A) Cells become resistant to insulin.
B) It can be delayed or prevented.
C) Most people with diabetes mellitus have this form.
D) Patients always require insulin.
Answer: D
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A bacteria contains two copies of the lac operon; one on the bacterial chromosome and one on a plasmid. The lacO site on the chromosomal lac operon is mutated and non-functional whereas the lacO site on the plasmid is functional. What is the most likely outcome for the bacterial cell when glucose is declining and lactose is present?
A. Expression of lac structural genes on the chromosome and plasmid will decrease because two copies of the lacO site are needed for repression of the lac operon. B. Expression of lac structural genes on the chromosome and the plasmid will increase because more repression of the lac operon occurs as glucose decreases. C. Expression of lac structural genes on the chromosome and plasmid will increase because the lacO site does not affect the CAP protein that activates the operon. D. Expression of lac structural genes will not change because the lacO site is not involved in repression of the lac operon.
The ultimate source of energy for almost all living organisms is:
a. heat. b. glucose. c. carbohydrates. d. lipids. e. the sun.
Which of the following is the advantage that plants in arid habitats experience when they keep their stoma closed during hot daytime hours?
A. It brings minerals up the plant. B. It gives plants a needed rest. C. It prevents sugar transport to the guard cells. D. It helps to conserve water. E. It prevents loss of CO2.
A procedure that divides organisms into two or more groups depending on their individual reactions to the same staining procedure is referred to as ________ staining.
Fill in the blank(s) with the appropriate word(s).