In pine trees, megaspores develop within a(n) ____
a. sporopollenin
b. ovule
c. seed
d. pollen tube
e. pollen grain
ANSWER: b
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Semiconservative replication refers to
A. an original parent DNA strand and one newly synthesized DNA strand comprising a new DNA molecule. B. a purine always bonding to a pyrimidine. C. each base bonding at the 1' position of the sugar. D. one helix strand that runs from the 5' to 3' direction and the other strand that runs from the 3' to 5' direction.
Transmembrane movement of a substance down a concentration gradient with no involvement of membrane proteins is called ________
Fill in the blank with correct word.
Figure _________ represents meiosis II for an organism with a diploid number of 4.
A. A
B. B
C. C
D. D
Which of the following is NOT a characteristic of the sponges?
A. Sponges have an osculum, an opening in the upper body. B. Sponges can reproduce sexually or asexually. C. Sponges have three tissue layers. D. If the cells of a sponge are mechanically separated, they will spontaneously reassemble into a complete and functioning sponge. E. Sponges are filter feeders.