Identify the structure that does NOT have a double membrane protecting it.
A) nucleus
B) chloroplast
C) mitochondria
D) ribosome
Ans: D) ribosome
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The part of the stomach designated by the letter “C”
in the above figure is called a. pyloric sphincter. b. esophagus. c. mucosa. d. duodenum. e. none of these.
A scientific theory will involve four of the following. Which is the exception?
a. subjective conclusions b. carefully stated hypothesis c. repeated controlled experiments d. revisions or rejection if new evidence comes to light e. explanation of a large number of observations
Enzyme used to position nucleotides during DNA replication
(A) DNA ligase (B) DNA polymerase (C) RNA polymerase (D) Restriction enzyme (E) Reverse transcriptase
Speciation is more likely to happen when there is significant gene flow between populations.
a. true b. false