During days 8 and 9 after fertilization in humans, ____
a. amnion cleavage begins
b. a blastocyst forms
c. an embryonic disk is formed
d. implantation occurs
e. gastrulation occurs
ANSWER: d
Biology & Microbiology
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Chitinases are examples of ____
a. systemins b. phytoalexins c. PR proteins d. R genes e. heat-shock proteins
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Inversions occur when a portion of a chromosome is ________
a. relocated on a different chromosome b. lost c. repeated two or more times d. oriented in a reversed direction
Biology & Microbiology
Which of the following molecules is the most
common photosynthetic pigment in plants?
a. chlorophyll a b. chlorophyll b c. chlorophyll c d. chlorophyll d e. chlorophyll e
Biology & Microbiology
The ________ zone extends from a depth of 200 to 4000 meters.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology