The ion that increases its intracellular concentration in order to trigger the release of neurotransmitters is _____.

A. Mg2+
B. K+
C. Ca2+
D. Cl-
E. HCO3-


C. Ca2+

Biology & Microbiology

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Unlike the leading strand, ______________ are made in replicating the lagging strand of DNA.

A. primers B. nucleases C. Okazaki fragments D. pyrophosphates E. DNA polymerases

Biology & Microbiology

Within chloroplasts, the fluid-like matrix in which the Calvin cycle occurs is called ________.

A. stroma B. mesophyll C. thylakoids D. grana

Biology & Microbiology

What combination of the characteristics of Huntington's disease puzzled JBS Haldane?

What will be an ideal response?

Biology & Microbiology

Answer the following statements true (T) or false (F)

1. Prokaryotic genomes often contain a circular chromosome with hundreds of thousands of genes and highly repetitive DNA. 2. In humans, the genome is made up of 22 autosomes and 1 sex chromosome. 3. Some transposable elements contain a central region that encodes transposase, an enzyme that facilitates the actual transposition. 4. If a researcher determines that 25% of a liver cell's total genome encodes genes for metabolic enzymes, then he/she can conclude that metabolic enzymes make up 25% of the total protein composition of the cell. 5. A nerve cell and a muscle cell taken from the same individual would have two different sets of genes.

Biology & Microbiology