A key characteristic of echinoderms is ________.
A. their foot and mantle structures
B. their endoskeleton
C. their segmented body
D. their fused appendages
Answer: B
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The most common form of spontaneous replication error is
A) tautomeric shift. B) double-stranded DNA breaks. C) thymine dimer addition. D) base analogue addition. E) DNA intercalation.
In order for familial retinoblastoma to appear in the phenotype
A. one new mutation must occur in a normal tumor suppressor gene B. two new mutations must occur in a pair of normal tumor suppressor genes C. one new mutation must occur in a proto-oncogene D. an oncogene must mutate to a tumor suppressor gene
The diagram below shows the relationship between photosynthesis and cellular respiration. Which of the following statements best describes the relationship?
A) Photosynthesis and cellular respiration use light energy to produce chemical energy. B) Photosynthesis produces light energy while cellular respiration produces chemical energy. C) The reactants of cellular respiration are the reactants of photosynthesis. D) The products of cellular respiration are the reactants of photosynthesis.
What is the difference between a gene and an allele?
A gene is a form of a trait, and alleles make up genes. A gene is a sequence of bases in a DNA molecule, and an allele is an alternative version of a gene that codes for a different, but related, feature. A gene is a sequence of bases in a DNA molecule, and an allele is an alternative version of a gene that codes for the same feature. A gene describes a chromosome, and an allele describes an exact location of a gene on a chromosome. An allele and a gene are the same thing.