Many of the organic molecules associated with life can be created spontaneously under certain conditions. What do these conditions resemble?
A) Earth's core
B) Primordial Earth
C) The sun
D) A comet
B
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In Mendel's experiments on seed color in pea plants, when a dominant yellow seed-bearing plant was crossed with a recessive green seed-bearing plant, what was the approximate phenotypic ratio among the F2 generation?
A. 1 yellow: 3 green B. 1 yellow: 1 green C. 3 yellow: 1 green D. all yellow E. 9:3:3:1
Which of the following would be more likely to affect an animal's habitat than its niche?
a. rainfall b. prey abundance c. predators d. defense mechanisms e. species interactions
If too little carbon dioxide is moving out of the lungs, ____
a. the blood pH will rise b. oxygen levels will rise c. bronchioles will relax d. blood vessels will relax e. respiratory activity will decrease
A mature mRNA contains which of the following?
A. Exons B. 5' Cap C. 3' Poly-A-tail D. introns E. All of the above F. A, B, C, D G. A, B, C, H. B, C, D