An amino acid that is not an essential amino acid would be one that an animal __________.
a. can obtain from its own proteins
b. gets in sufficient quantities in its diet
c. has the needed enzymes to synthesize
d. obtains from its microbial symbionts
e. does not use in protein synthesis
Answer: c. has the needed enzymes to synthesize
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The data in the previous graphs indicate that _____
A) a hybrid zone was established after the completion of the bridge B) there was no migration between the two squirrel populations after the bridge was completed C) gene flow occurred from one type of squirrel into the gene pool of the other type of squirrel D) two-way migration of squirrels occurred across the bridge, but without hybridization E) some northern squirrels migrated south, but no southern squirrels migrated north across the bridge
Which of the following is the strongest evidence for
the idea that present-day eukaryotic aerobes are the descendants of the successful symbiotic association of anaerobes and aerobes? a. Mitochondria can produce ATP. b. A mitochondrion can survive indefinitely when removed from a eukaryotic cell. c. A mitochondrion has its own set of DNA molecules. d. Fossilized mitochondria are older than the oldest fossilized eukaryotes. e. All eukaryotic cells have mitochondria.
Variation that does not alter the ability to survive and reproduce:a
is not possible with natural selection. b. reduces genetic polymorphism. c. is only possible for polygenic traits. d. is not part of the gene pool. e. is called neutral variation
Based on rat studies that show how maternal nurturing helps offspring respond better to stress propose a model to help explain why human children who are abused have a higher suicide rate
What will be an ideal response?