Suppose you wanted to investigate ideas on how polymerization of prebiotic organic molecules may have occurred on the early Earth. Which of the following scenarios might best be utilized for this?
A. Mix some RNA nucleotides in water and heat them to boiling temperatures.
B. Mix some amino acids (protein building blocks) in water and add a strong acid or a strong base.
C. Mix some RNA nucleotides in water and repeatedly wet and dry them on clay.
D. Mix some amino acids (protein building blocks) in water and add a bacterium harmless to humans.
E. Mix some amino acids in salt water and cool down to 0? C.
C. Mix some RNA nucleotides in water and repeatedly wet and dry them on clay.
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Imagine that during her hunt, the same lioness wounds a gazelle. The gazelle is able to escape, but its blood pressure is rapidly decreasing as it loses blood. What can happen in the gazelle's body to increase blood pressure?
A. The pituitary gland can secrete vasopressin. B. The peripheral nervous system can signal specific arterioles to contract. C. The peripheral nervous system can signal specific arterioles to expand. D. The pituitary gland can secrete thyroid stimulating hormone (TSH).
In RNA synthesis, thymine is complementary
to
a. guanine b. adenine c. cytosine d. uracil e. more than one of these
Noncoding DNA
a. is "junk" DNA. b. is the cause of many genetic diseases. c. requires more study to determine its roles. d. is used for cloning. e. occurs only in some people.
Human body cells have 46 pairs of chromosomes. Body cells are known as _________ and are __________ These cells are created by mitosis .
Fill in the blank(s) with the appropriate word(s).