The phylogenetic distribution of the enzyme rubisco is limited to _____
A) only C3 plants
B) C3 and C4 plants
C) photosynthetic eukaryotes
D) bacterial and eukaryotic photoautotrophs
E) all living cells
Answer: D
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Almost all cases of cystic fibrosis, a(n) ____ genetic disorder, are the result of mating between two unaffected parents
a. mitochondrial b. autosomal dominant c. autosomal recessive d. X-linked dominant e. X-linked recessive
In some flowers, a purple pigment is synthesized from a red precursor pigment. In the absence of all pigment, flowers are white. A pure-breeding plant with red flowers was crossed to a pure-breeding plant with white flowers. All of the F1 plants had white flowers. The F1 plants were crossed to each other, and the F2 consisted of 165 plants: 123 with white flowers, 32 with purple flowers, and 11 with red flowers. How do these results suggest that flower color is determined?
A) One gene with two alleles exists and heterozygotes have a different phenotype than either homozygote. B) The dominant allele of one gene masks the effect of a second gene. C) The recessive allele of one gene masks the effect of a second gene. D) A dominant allele of two genes is necessary for purple flowers. E) A dominant allele of either of two genes is sufficient for purple flowers.
When two excitatory postsynaptic potentials (EPSPs) occur at a single synapse so rapidly in succession that the postsynaptic neuron's membrane potential has not returned to the resting potential before the second EPSP arrives, the EPSPs add together
producing _____. A) temporal summation B) spatial summation C) tetanus D) the refractory state
Hemoglobin transports oxygen in the blood and consists of a chain of 146 amino acids. If amino acids were incorporated into hemoglobin in the same proportions, approximately how many alanine residues would you predict to find in hemoglobin?
A. 7 B. 2 C. 146 D. 20 E. 36