____ are involved in all aspects of growth, development, and function in plants. They often work together, with synergistic or opposing effects on cells
a. Enzymes
b. Starches
c. Sugars
d. Peptides
e. Hormones
e
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The immediate energy system fuels muscle cells
a. with ATP only. b. with ATP and creatine phosphate. c. by glycolysis alone. d. by the Krebs cycle alone. e. by the electron transport system alone.
When applying the Hardy-Weinberg law to a gene with dominant and recessive alleles, calculation of the allele
frequencies always begins by writing the frequency of the _____________________ phenotype, then taking the _____________________ of this to obtain the frequency of the recessive allele. Fill in the blank(s) with the appropriate word(s).
The carbohydrate in DNA is
A) ribose. B) deoxyribose. C) glucose. D) phosphate. E) cellulose.
The human b-globin gene has two alleles, HS and HA, individuals that are homozygous for HS have sickle-cell anemia and a lower fitness. Individuals that are heterozygotes (HSHA) do not show sickle-cell symptoms and have a resistance to malaria. Individuals that are homozygous for HA have the highest fitness but are susceptible to malaria. In areas where malaria is prevalent the HS allele is maintained in the population. Which type of selection is occurring with the b-globin gene?
A. directional B. disruptive C. stabilizing D. negative frequency dependent E. balanced