When environmental estrogens trigger premature puberty in girls, the main organs affected are the
A) ovaries.
B) thyroid gland and pituitary gland.
C) adrenal cortex.
D) pituitary gland and parathyroid glands.
Answer: A
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A biome is
A) the thin layer surrounding the Earth that supports all life. B) all the populations of different species living and interacting within an ecosystem. C) a broad-scale region dominated by similar types of ecosystems. D) an area of land or water composed of a patchwork of communities and ecosystems.
Some members of the alphaproteobacteria produce a structure called a (filament/prostheca/pilus) to produce extra surface area for nutrient absorption
What will be an ideal response?
In recessive lethal diseases such as Tay-Sachs disease, carriers have one copy of the normal allele and one copy of the allele for the disease. Carriers are represented in the Hardy-Weinberg formula by ________.
A. 2pq B. 1 - q C. the Hardy-Weinberg equilibrium D. the frequency of homozygous dominants plus frequency of heterzygotes plus the frequency of homozygous recessives
In science, the word "theory" ____
a. is an explanation that has not been published b. has essentially the same meaning as a prediction c. is based mostly on opinions d. signifies that a hypothesis has been tested and proven over a period of time e. means that a scientist has a hunch something is true