In which structure do cilia covered in mucus trap foreign particles?
a. urinary tract
b. reproductive tract
c. arteries
d. respiratory tract
e. digestive tract
ANSWER: d
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In the tropisms with which it is involved, auxin
causes
a. rapid cell division. b. hardening of cell walls. c. cell elongation. d. increased plasma membrane permeability. e. increased protein synthesis
This image represents:
1.sister chromatids
2.a duplicated chromosome
3.two alleles
4.homologous chromosomes
What accounts for the fact that polydactylism is prevalent and Tay-Sachs disease virtually absent in
one human population in the United States, while Tay-Sachs disease is prevalent and polydactylism virtually absent in another? a. Natural selection has promoted these differences since humans live in many different environments. b. Mutation rates differ between different loci. c. There is little gene flow between the two populations. d. The populations are small, and therefore genetic drift is a major factor in the determination of allele frequencies. e. Genetics is an unpredictable science.
All of the following pertain to transcription except
A) Required RNA polymerase B) Requires a template DNA strand C) Requires a promoter D) Occurs on a ribosome in the cytoplasm E) Occurs before translation