The biological species concept emphasizes the ability of individuals to ____
a. adapt to the environment
b. have greater longevity
c. intermingle with other species
d. live in a variety of habitats
e. interbreed and produce fertile offspring
ANSWER: e
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When crossing an organism that is homozygous recessive for a single trait with a heterozygote, what is the chance of producing an offspring with the homozygous recessive phenotype?
A) 0% B) 25% C) 50% D) 75% E) 100%
The loops of Henle create a concentration gradient in the interstitial fluid surrounding the loop, with the concentration highest in the _____ and lowest in the _____ of the kidney
A. inner medulla; cortex B. outer medulla; inner medulla C. outer medulla; cortex D. cortex; inner medulla E. cortex; outer medulla
Saturated fats should be __________________ in your diet.
A. in the form of oils B. about 50% of the Calories C. consumed as plants D. as low as possible
The half-life of a radioactive isotope is 10,000 years. This isotope and its breakdown product do not normally occur together before molten rock cools and becomes solid. You analyze a volcanic rock and find 25 percent of the original amount of
radioactive isotope remains, and 75 percent has decayed to its daughter element. How long ago did the rock solidify? A) 2,500 years ago B) 20,000 years ago C) 50,000 years ago D) 10,000 years ago