Which best explains the process of meiosis?
A. The cells that result from meiosis I are haploid, and each chromosome consists of 1 chromatid.
B. The cells that result from meiosis I are haploid, and each chromosome consists of 2 chromatids.
C. The cells that result from meiosis II are haploid, and each chromosome consists of 2 chromatids.
D. The cells that result from meiosis I are diploid, and each chromosome consists of 2 chromatids.
E. The cells that result from meiosis I are diploid, and each chromosome consists of 1 chromatid.
B. The cells that result from meiosis I are haploid, and each chromosome consists of 2 chromatids.
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How do viability stains usually distinguish between living cells and dead cells?
A) The chemical fluoresces only when bound to ribosomes that are actively synthesizing proteins. B) The chemical stain is taken up by living cells and once metabolized becomes fluorescent. C) The dye specifically targets intact cytoplasmic membranes. D) The dye's fluorescence is quenched by dead cells.
Which of the following is moved from one side of a lysosomal membrane to the other via a transport channel? Select all correct choices
A. protons B. broken-down macromolecules C. enzymes capable of breaking down macromolecules being delivered from the Golgi apparatus D. protons and broken-down molecules
In fruit flies (Drosophila), an embryo during gastrulation:
A. begins enclosing nuclei within their own cell membranes. B. forms its three germ layers. C. becomes organized into distinct segments. D. forms three germ layers and becomes organized into distinct segments. E. begins enclosing nuclei within their own cell membranes, forms three germ layers, and becomes organized into distinct segments.
Which of the following is the correct
difference between rough endoplasmic reticula and smooth ER?
a. rough ER is an extension of the nuclear envelope; smooth ER is not b. smooth ER has a double bilayer membrane; rough ER does not c. smooth ER consists of flattened sacs and tubes; rough ER does not d. rough ER has a surface studded with ribosomes; smooth ER does not e. smooth ER synthesizes proteins: rough ER does not