_____ the number of chromosomes is produced in the process of meiosis in a haploid-dominant organism.
a. One half
b. One quarter
c. Two thirds
d. Three quarters
a. One half
One half the number of chromosomes is produced in the process of meiosis in a haploid-dominant organism.
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Which of the following is a feature of the tube-within-a-tube body plan in most animal phyla?
A) The outer tube consists of a hard exoskeleton. B) The outer tube consists of digestive organs. C) The mouth and anus form the ends of the inner tube. D) The two "tubes" are separated by tissue that comes from embryonic endoderm.
Fluorescence occurs when ____
a. a high-energy electron returns to its ground state by releasing energy in a photon b. a low-energy electron moves to a high-energy state by absorbing heat c. a high-energy electron leaves its nucleus and moves to a different molecule d. a pigment molecule accepts a high energy electron and releases a photon of energy e. the energy from an electron is transferred to a different molecule while the electron returns to the ground state
The poor fishing off the coast of Peru
associated with El Niño is related to oceanic a. lack of typical oceanic upwellings. b. upwellings. c. thermal inversions. d. cyclonic activity. e. oxygen depletion
How does carbon dioxide enter a leaf?
A) CO2 diffuses through the epidermis into the mesophyll. B) CO2 passes through openings called stomata on the leaf surface. C) Dissolved CO2 is transported from roots to leaves in the xylem. D) Atmospheric pressure forces CO2 through pits on the leaf surface. E) CO2 is moved by active transport into the leaf by special cells called guard cells.