Sperm cells are the only type of cell in animals that have:
A) cilia.
B) a flagellum.
C) pili.
D) cytoplasm.
E) genetic material.
B) a flagellum.
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Before the development of the Haber-Bosch process, NH3 could be produced by ____________ only
A. fungi B. plants C. prokaryotes D. respiration
An enzyme
A) decreases the rate of a reaction. B) binds substrates in a manner that facilitates the formation of product. C) changes the position of the equilibrium of the reaction. D) does not change the rate at which the equilibrium is achieved. E) is always a protein.
What allows mammals to process a wider variety of foods than other vertebrates?
a. They have two types of teeth. b. They have four types of teeth. c. They have jaws. d. They have larger mouths. e. They have sharper teeth.
What insight did Nettie Stevens's studies of the beetle Tenebrio molitor provide about the chromosome theory of inheritance?
A) Genes are located on chromosomes. B) The number of autosomal chromosomes varied between gametes. C) Crossing over occurs between homologous chromosomes. D) Sex is determined by the presence of an X or Y chromosome in the male gamete. E) Chromosomes assort independently into the haploid gametes.