The head of a sperm cell contains a specialized organelle called the ____ , which contains enzymes used to transverse the outer coating of the egg
Fill in the blank with the appropriate word.
acrosome
You might also like to view...
Genotype is to _____ as phenotype is to _____
A) DNA base sequence; physical traits that are products of the proteins produced B) heredity; DNA base sequence C) gene regulation; translation D) transcription; amino acid sequence
Population increase is most influenced by ____
a. percentage of humans in the pre-reproductive and reproductive age groups b. number of individuals in the post-reproductive age groups c. percentage of individuals in the reproductive age groups d. number of women in the reproductive age groups e. number of men in any age group
Scientists measured the pressure in the xylem of redwood trees at different heights and found that the higher they made their measurements, the lower the pressure. They extrapolated this to a pressure of zero, and concluded that the tallest a tree could grow is 122-130 meters. The tallest known tree on Earth is 112.7 meters. What assumption were the scientists making to conclude that when pressure was zero the plant could grow no further?
A. Any leaves above that point would not receive sunlight. B. Any leaves above that point would not receive water. C. Stems above that point could not transport sugars in their xylem. D. Transpiration would be less than uptake of water from the xylem. E. The osmotic pressure would be greater than gravity.
How do restriction enzymes cut DNA sequences?
a. They cut DNA at sequences that have lots of adenine bases. b. They have the ability to cut DNA randomly. c. They cut DNA at sites, called recognition sites, that have specific nucleotide sequences.