Which of these is a type of prokaryotic cell?
A. a mushroom cell
B. a plant cell
C. a worm cell
D. a bacterial cell
D. a bacterial cell
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The largest documented mass extinction on Earth occurred:
A. 252 million years ago. B. 25 million years ago. C. 6.5 million years ago. D. 65 million years ago. E. 650 million years ago.
Match the following items to the correct phrase.
_______1. Gram-positive cocci in clusters. _______2. Gram-positive diplococci. _______3. Gram-negative diplococci. _______4. Gram-positive cocci in chains. a. Most Streptococcus spp. b. Staphylococcus spp. c. Neisseria spp. d. Streptococcus pneumoniae
New alleles in a population come about through ____
a. natural selection b. genetic drift c. gene flow d. inheritance e. mutations
Mendel studied tall and short pure-breeding lines of pea plants. Inherited genetic variation would dictate that one line would produce tall plants and the other short plants, but the genes and phenotypes are influenced by what external factor?
What will be an ideal response?