Homologous chromosomes can be defined as:
A. pairs of chromosomes that cannot undergo
DNA hybridization.
B. pairs of chromosomes that match in size
and appearance.
C. pairs of chromosomes that share the same
genes but differ in gene order.
D. identical double helices of DNA that are
the products of DNA replication.
E. pairs of chromosomes between different
species that carry approximately the same
genes in the same locations.
B
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Which of the following statements is NOT true?
A. Frogs and toads have external fertilization whereas salamanders and caecilians have internal fertilization. B. Frogs, toads, and most salamanders have four legs whereas caecilians are legless. C. Frogs, toads, and salamanders lay eggs whereas some caecilians lay eggs and others give birth to live young. D. Salamanders and caecilians have external tails whereas frogs and toads do not. E. Adult frogs, toads, and salamanders are predators on insects and other small animals whereas caecilians are herbivores.
When experimenting with Streptococcus pneumoniae in the 1920s, Griffith concluded that some substance from the dead S strain bacteria passed to the R strain bacteria, imparting virulence and the ability to form a capsule. Avery and others continued the search for the substance that "transformed" the R strain into the S strain.Hypothesis I:Genetic material or "transforming substance" is protein.Hypothesis II:Genetic material or "transforming substance" is RNA.Hypothesis III:Genetic material or "transforming substance" is DNA.An experiment was performed in which DNAase enzyme digestion prevented transformation. This finding
A. supports Hypothesis I. B. supports Hypothesis II. C. supports Hypothesis III. D. rejects Hypothesis I only. E. rejects Hypothesis II only. F. rejects Hypothesis III only. G. does not support any of these hypotheses.
The genus Mycobacterium includes species responsible for
A) tuberculosis. B) urinary tract infections. C) food poisoning from contaminated dairy products. D) gastric ulcers. E) food poisoning from contaminated meat.
The combination of DNA and protein in the nucleus of a eukaryotic cell is called:
a. nucleoplasm b. plasmids c. nucleoids d. chromatin