In __________, one of the sperm cells in the pollen tube fertilizes the egg, forming a zygote; the other

fuses with the endosperm mother cell and gives rise to __________. Fill in the blank(s) with the appropriate word(s).


double fertilization; endosperm

Biology & Microbiology

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The method that indicates the age of a substance by measuring the relative content of a radioisotope and its daughter

elements is called ____ dating.

a. fossil b. radiometric c. isotope d. zircon e. uranium

Biology & Microbiology

Migrating cells move around the developing embryo using ____

a. electrical signals b. genetic markers c. apoptosis d. adhesive cues e. osmosis gradients

Biology & Microbiology

The enzyme found in tears that can digest bacterial cell walls is called:a

protease. b. lysozyme. c. interferon. d. cytokine. e. defensin.

Biology & Microbiology

The most successful mammals belong to the marsupials group.

Answer the following statement true (T) or false (F)

Biology & Microbiology