What do DNA and RNA have in common?
A. Both contain deoxyribose.
B. Both are composed of nucleotides.
C. Both form double helices.
D. They are composed of the same nucleotides.
C. Both form double helices.
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Match the following items with the correct phrases.
_______1. Crenation of red blood cells would occur if they were placed into a(n) __________ solution. _______2. Adding large quantities of salt or sugar to various types of foods is a way of preserving them. If bacteria should enter such foods, they would find themselves in a(n) __________ environment. _______3. If red blood cells were placed into a(n) __________ solution, they might hemolyze. a. hypertonic b. hypotonic c. isotonic d. gin and tonic
A single pregnant female parakeet arrives in Hawaii early in its history. After millions of years her
descendants have successfully adapted to a variety of foods and habitats. This is the result of:
a. genetic drift b. adaptive radiation c. a higher rate of mutation d. punctuated equilibrium e. sympatric speciation
The male reproductive whorl of a flower typically consists of one or more
a. petals. b. carpels. c. stamens. d. receptacles. e. sepals.
In which cells would you expect to find the highest level of telomerase?
A. adipose tissue cells B. muscle cells C. cells that replenish the lining of the gut D. neurons