Crossing over is one of the most important events in meiosis because
a. it produces new arrays of alleles on chromosomes.
b. homologous chromosomes must be separated into different daughter cells.
c. the number of chromosomes allotted to each daughter cell must be halved.
d. homologous chromatids must be separated into different daughter cells.
e. it is the mechanism through which twins are produced.
A
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The earliest nervous system likely resembled a:
A. nerve cord. B. ganglia. C. simple brain and nerve cord. D. nerve net.
The food products most commonly contaminated with Salmonella strains are
A. meat and seafood. B. milk and cheese. C. fruit and vegetables. D. eggs and poultry
In the presence of water, nonpolar associations form between molecules or regions of molecules that
are ____.
a. partially charged b. hydrophobic and hydrophilic c. hydrophobic d. fully charged e. hydrophilic
When a haploid spore germinates, it goes through mitosis, forming hyphae. The resulting hyphae would be which of the following?
A. haploid B. zygotes C. diploid D. dikaryotic E. gametes