What two hormones are involved in regulating the blood calcium level?
A. PTH and calcitonin
B. renin and PTH
C. calcitonin and renin
D. aldosterone and PTH
E. renin and aldosterone
Answer: A
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Antibodies are insoluble proteins
Indicate whether the statement is true or false.
As muscles contract, ________
a. actin heads bind to myosin filaments and slide them toward the middle of the sarcomere b. myosin heads bind to actin filaments and slide them toward the middle of the sarcomere c. myosin filaments change position d. filaments change length
Which of these differences in phenotypes could create a prezygotic barrier?
a. dogs too small to carry their offspring to term b. birds with long beaks instead of short beaks c. a whale that sings at decibels of 52Hertz (Hz) instead of 40Hz d. a goat with red hair instead of black hair
After a restriction enzyme cuts DNA into fragments and the fragments pair with complementary bases, the enzyme
____________________ is used to seal the gaps in the phosphate backbone. Fill in the blank(s) with the appropriate word(s).