Which of the following are mechanisms to prevent polyspermy? (Check all that apply.)A) Altering the composition of the exterior egg coatB) Change in the membrane potential of the eggC) Cortical granule enzymes remove sperm receptors from egg.D) Special proteins inside the egg compare the DNA of different sperm, choosing the most adapted one.E) Toxic molecules exit the egg to attack the extra sperm.F) Vitelline envelopes lift off the surface of egg.

What will be an ideal response?


A, B, C, F

Biology & Microbiology

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A small amount of DNA is collected from a crime scene. However, the amount of DNA collected is insufficient to perform the necessary experiments to link a suspect to the crime. Which method could be utilized to increase the amount of DNA?

A. polymerase chain reaction (PCR). B. DNA sequencing. C. fluorescent labeling of DNA. D. microarray analysis. E. gel electrophoresis.

Biology & Microbiology

If 0.04% (0.0004) of the people in a population has sickle cell anemia, the percent of heterozygotes in the population

must be _____________________ percent. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Which statement is NOT correct about the sporophyte generation in gymnosperms?

a) It is the diploid generation. b) They are homosporous. c) It contains vascular tissue. d) They produce winged naked seeds. e) It is the dominant generation.

Biology & Microbiology

The (cestodes/nematodes/trematodes) are helminths with an incomplete digestive system

What will be an ideal response?

Biology & Microbiology