The male gametophytes of seed plants consist of a few cells enclosed by a sturdy wall made mostly of the resistant
polymer ____.
a. sporopollenin
b. xylan
c. lignin
d. cellulose
e. pectin
ANSWER: a
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In cnidarians, the mouth of both the medusa and polyp form opens into an internal ____ where _____ digestion takes place
A. gastric cavity; extracellular B. gastric cavity; intracellular C. mesoglea; extracellular D. mesoglea; intracellular E. none of these
Which element is most likely to share electrons with other atoms in joint orbitals?
a. chlorine (7 valence electrons) b. calcium (2 valence electrons) c. argon (8 valence electrons) d. carbon (4 valence electrons) e. potassium (1 valence electron)
Chloe has the scaly skin condition icthyosis, which is X-linked recessive. Which of the following is most likely true?
A) Her mother and father were both unaffected carriers. B) Her mother was affected and her father was unaffected. C) Her father was a carrier. D) Her mother was a carrier and her father was affected.
Some of the useful applications of genetic engineering include (select all that apply)A) bacteria that can digest oil in an oil spill.B) growing glyphosate-resistant cotton.C) development of hybrid corn to increase yield.D) creating Golden Rice.
What will be an ideal response?