Which statement concerning a scientific theory is FALSE?
a. It is unchangeable.
b. It predicts new facts.
c. It is based on a number of hypotheses.
d. It may suggest practical applications.
e. It is supported by many observations.
a
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The morning-after pill works by ____
a. blocking ovulation or fertilization b. blocking passage of sperm through the female reproductive tract c. blocking passage of sperm through the male reproductive tract d. causing shedding of the endometrial lining and any implanted embryo e. increasing the effectiveness of the acrosomal reaction
Decomposers are primarily autotrophs
Indicate whether the statement is true or false
In a dividing fruit fly cell lacking components of the centralspindlin complex,
A) the nuclear envelope remains intact. B) the centrosome fails to duplicate. C) sister chromatids fail to separate for anaphase A. D) no anaphase B occurs. E) cytokinesis begins, but the cleavage furrow regresses.
Which of the following statements concerning bacterial growth at high temperatures is not true?
A) High temperatures denature enzymes B) High temperatures are microbistatic C) High temperatures are microbicidal D) High temperatures destroy lipids