Once an egg has been fertilized, what event is crucial for preventing additional sperm from inserting DNA into the egg?

A. the acrosomal reaction
B. cleavage
C. follicle maturation
D. the cortical reaction


Answer: D

Biology & Microbiology

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Excretory organs known as Malpighian tubules are present in _____

A) earthworms B) flatworms C) insects D) jellyfish E) sea stars

Biology & Microbiology

Xylem sap and soil water differ in _________ because of ___________

A. solute composition; selective uptake by the endodermis B. solute composition; selective uptake by mycorrhizae C. solute composition; selective uptake by the epidermis D. pH; H+ exclusion by the endodermis

Biology & Microbiology

Which of the following tissue types is used as the body's reserve of energy?

a. Loose connective b. Blood c. Cartilage d. Dense irregular e. Adipose

Biology & Microbiology

atomic number

What will be an ideal response?

Biology & Microbiology