Organs are made up of ________ type(s) of tissue.
A. Two or more
B. Two
C. One
D. At least five
Answer: A
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Embryonic development begins with a single egg fertilized by a single sperm forming a zygote. The
zygote then undergoes mitosis; how many cells would be present at the conclusion of 4 mitotic divisions?
a. 2 b. 4 c. 8 d. 16 e. 32
In flowering plants, one sperm nucleus fuses with an
egg nucleus, and a zygote forms that develops into an embryo. Another sperm nucleus a. fuses with a primary endosperm cell to produce three cells, each with one nucleus. b. fuses with a primary endosperm cell to produce one cell with one diploid nucleus. c. fuses with the endosperm mother cell, forming a primary endosperm cell with a single triploid nucleus. d. fuses with one of the endosperm mother cell nuclei to produce a diploid tissue that serves as the food supply for the embryo. e. degenerates.
A difficult task for the biologist trying to determine if a group of organisms is a separate species is __________.
a. to compare appearances of different organisms b. to determine if a hybrid offspring is produced c. exposing isolating mechanisms d. determining whether group members breed with organisms outside the group e. comparing DNA from those
Describe at least three physical mechanisms that are part of the first line of defense
What will be an ideal response?