In early ancestors of the modern giraffe, longer necks allowed animals to reach higher tree branches as food. This would lead to ____ in the ancestral giraffe population.
A. disruptive selection
B. directional selection
C. sexual selection
D. genetic drift
E. stabilizing selection
B. directional selection
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Photosynthesis first occurs on Earth by about
___ years ago.
a. 4.6 billion b. 3.5 billion c. 2.7 billion d. 1.1 billion e. 0.5 billion
In the human male and female reproductive systems, each system contains paired primary sex organs called _____, which contain _____ cells that give rise to gametes.
A. testes; sperm B. gonads; germ C. ovaries; egg D. bulbourethral glands; germ E. All of the answer choices are correct.
Which of the following statements about enzymes is FALSE?
The active site of the enzyme is where the chemical reaction takes place. The substrate binds to the enzyme with low specificity. The enzyme undergoes a conformational change that brings substrates closer together in an induced fit. The optimal activity of an enzyme occurs over a narrow temperature range. The optimal activity of an enzyme occurs within a narrow pH range.
Only the LDCs will be experiencing overpopulation growth in the near future.
Answer the following statement true (T) or false (F)