In many species, there are two representatives of each chromosome. In such species, the characteristic number of chromosomes is called the ________ number. It is usually symbolized as ________
A) haploid; n
B) diploid; n
C) diploid; 2n
D) haploid; 2n
E) None of the answers listed is correct.
C
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A biologist ground up some plant leaf cells and then centrifuged the mixture to fractionate the organelles. Organelles in one of the heavier fractions could produce ATP in the light
, whereas organelles in the lighter fraction could produce ATP in the dark. The heavier and lighter fractions are most likely to contain, respectively, _____. A) mitochondria and chloroplasts B) chloroplasts and peroxisomes C) peroxisomes and chloroplasts D) chloroplasts and mitochondria E) mitochondria and peroxisomes
The primary role of oxygen in cellular respiration is to _____
A) yield energy in the form of ATP as it is passed down the respiratory chain B) act as an acceptor for electrons and hydrogen, forming water C) combine with carbon, forming CO2 D) combine with lactate, forming pyruvate E) catalyze the reactions of glycolysis
Many factors are believed to reduce songbird breeding success in fragmented habitats. Select the
exception.
a. brood parasitism by cowbirds b. nest predation by blue jays c. lack of necessary habitat types d. nest predation by domestic cats e. increased connections between habitats
Scientists can fill in gaps in defining species by DNA sequence analysis.
a. true b. false