Once an egg has been fertilized, what event(s) are crucial for preventing additional sperm from inserting chromosomes into the egg?

A. the acrosomal reaction
B. the cortical reaction
C. the fast block to polyspermy
D. both the acrosomal and cortical reactions
E. both the cortical reaction and fast block to polyspermy


E. both the cortical reaction and fast block to polyspermy

Biology & Microbiology

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The DNA Pol III enzyme can use mRNA to make a cDNA strand

Indicate whether the statement is true or false

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Glucose molecules provide energy to power the swimming motion of sperm. In this example, the sperm are changing ________

A) chemical energy into kinetic energy
B) chemical energy into potential energy
C) kinetic energy into potential energy
D) kinetic energy into chemical energy

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In which stage of mitosis does exchange of genetic material between chromosomes (crossing over) occur?

A) prophase II B) prophase I C) anaphase I D) none of the above

Biology & Microbiology

STRs are named based on the number of repeating units they contain.

a. true b. false

Biology & Microbiology