Nearly half of the pregnancies that end in miscarriage have:a
trisomy of chromosome 21.
b. homozygosity for a recessive lethal allele.
c. major chromosomal abnormalities.
d. Klinefelter syndrome.
e. Down syndrome.
C
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The two amino acids depicted above both have side groups (R groups) that are
a. acidic and polar. b. uncharged and nonpolar. c. basic and polar. d. positively and negatively charged and nonpolar. e. uncharged and polar.
Systems biology is also called integrative biology
__________________ Indicate whether the statement is true or false.
All of the following are advantages of gas exchange in air, as compared to gas exchange in water,
except:a. air is less dense than water. b. air contains a higher concentration of oxygen. c. less energy is needed to move air over a gas exchange surface. d. oxygen diffuses more slowly through air than water. e. air is less viscous than water.
In animals with a closed circulatory system, gas exchange occurs across the thin walls of ________
A) arteries B) arterioles C) capillaries D) venules