Mammals such as the vampire bat have the ability to generate a urine with a concentration of approximately 3,600 millisomoles (mOsm). If the concentration of their blood is approximately 300 mOsm, their water loss is ______ by producing a concentrated urine.
A. reduced by approximately 11/12
B. reduced by approximately ½
C. actually increased by approximately ½
D. reduced by approximately 5/6
E. not reduced
A. reduced by approximately 11/12
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Indicate whether this statement is TRUE or FALSE.
Ovulation involves the
a. production of the first polar body. b. release of a secondary oocyte. c. beginning of the follicular phase of the menstrual cycle. d. suspension of the meiotic process. e. deterioration of the corpus luteum.
A city was intensively sprayed with the chemical DDT to control houseflies. The number of houseflies was immediately greatly reduced
Each year thereafter, the city was sprayed again, but the flies gradually increased in numbers until 10 years later when they were as abundant as they were before the control program began. Provide an evolutionary explanation of what happened.
Which of the following is not required for T cell activation?
A) involvement of CD4 or CD8 B) bound antigen C) MHC I or II D) antibody E) co-stimulatory proteins