Crossing over is important because it

1.eliminates a bad allele from being in an egg or sperm cell.
2.increases the variation in the DNA of eggs and sperm.
3.increases the number of alleles in the eggs and sperm.
4.changes the alleles for traits on a chromosome.


2

Biology & Microbiology

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Indicate whether the statement is true or false

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The cell wall of Gram-positive bacteria

A. contains a thin layer of peptidoglycan. B. contains a thick layer of peptidoglycan. C. is, due to its thickness, an excellent barrier to most molecules. D. contains an outer membrane containing LPS. E. contains a thin layer of peptidoglycan AND contains an outer membrane containing LPS.

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Plasmodium falciparum reproduce in the ___ of humans

A. white blood cells B. red blood cells C. lymph notes D. intestines

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__________ are an ancient fungal group and the only fungi with flagellated spores and gametes.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology