Ribosomes are made up of:
A. only RNA molecules.
B. only DNA molecules.
C. DNA and RNA.
D. protein and RNA.
E. only protein molecules.
D
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What is a typical characteristic of bacterial chromosomes?
A) On average 5% of the genome encodes proteins. B) It has telomeres. C) It is linear. D) On average a gene occurs once in every 1000 bp. E) It is single-stranded DNA.
Hummingbirds are attracted to red flowers with long tubes. What might you predict would happen to flowers if hummingbirds become the predominant species on a remote island?
A) Flowers would become gradually more red. B) Flowers would develop shorter tubes. C) Hummingbirds would develop longer beaks. D) Hummingbirds would become extinct.
A covalent bond is
A. the attraction that one atom has for another atom. B. the attraction between two atoms, formed by the sharing of electrons. C. formed between the positive charge of a hydrogen atom in one molecule and the negative charge of a nitrogen atom in another nearby molecule. D. the attraction between a positive ion and a negative ion.
Animal cells need oxygen most directly to:
A) produce protein. B) secrete enzymes. C) produce DNA. D) produce ATP.