When the oxygen level in the blood is low, which of the following secretes erythropoietin, causing an

increase in red blood cell production?
a. lungs
b. kidneys
c. liver
d. spleen
e. pancreas


B

Biology & Microbiology

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Which of the following accounts for the negative

control of operons? a. promoters b. repressors c. structural genes d. operators e. all of these

Biology & Microbiology

Which is a characteristic of a good hypothesis?

a. It is falsifiable. b. It is a statement of fact. c. It can only be tested once. d. It can be proven to be true. e. It represents important conclusions.

Biology & Microbiology

Who suggested that giraffes developed their long necks over time by stretching?

A) Wallace B) Plato C) Darwin D) Cuvier E) Lamarck

Biology & Microbiology

System of membranous saccules and channels in the cytoplasm, often with attached ribosomes.

What will be an ideal response?

Biology & Microbiology