In an unstimulated neuron, the plasma membrane is most permeable to ________ ions

A) sodium (Na+)
B) sugar
C) calcium (Ca2+)
D) potassium (K+)
E) chloride (Cl?)


D

Biology & Microbiology

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Which of the following is an example of one codon?

A) CATT B) GCCATT C) CAG D) CCGUAA

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The process of imprinting of a gene:

A. ensures that both alleles of a particular gene contribute to the phenotype. B. is a mechanism to completely shut down the expression of an allele derived from one parent in a diploid cell. C. relies on the DNA sequence alone. D. All of the choices are correct.

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Treated sewage released into the ocean adds large amounts of ____ into the water

a. bacteria b. DDT c. PCBs d. chlorine e. zinc

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The end result of cleavage is a(n) ____

a. blastula b. gastrula c. zygote d. embryo e. mesoderm

Biology & Microbiology