Which of the following adds individual nucleotides to the 3' end of an existing strand to build a new DNA strand during DNA replication?
a. topoisomerase
b. primase
c. DNA polymerase
d. helicase
e. DNA ligase
C
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A mechanism shared by both extracellular and intracellular digestion is
A. the ability to phagocytose food particles. B. a slow speed of digestion. C. the presence of a digestive cavity. D. the ability to consume both large and small food items.
When a hypothesis stands after years of tests and is consistent with all of the data gathered, it is referred to as a(n) ________
a. educated guess b. law of nature c. scientific theory d. sampling error e. prediction
Around 580 million years ago, the first simple animals are seen in the fossil record. These first fossilized animals
a. had a hard protective shell protecting their bodies. b. were photosynthetic. c. were predominantly trilobites. d. were all land animals. e. were probably not related to the modern jellyfish and worms they resembled.
Which of the following are characteristics of a keystone species?
A. They are most often mammals. B. They evoke a strong emotional response in people. C. Their presence dictates the survival of the entire community. D. They have a very large population. E. None of these are characteristics of keystone species.