Which of the following is/are TRUE regarding neurulation?
a. anencephaly and spina bifida are defects that occur during neural tube formation
b. neural tube defects are often caused by Vitamin B9 deficiency during development
c. neural tube defects are due to over-proliferation of cells
d. a and b
Answer: d. a and b
You might also like to view...
Respiration is called aerobic because ________.
A. it happens in the absence of oxygen B. it requires oxygen C. it happens in mitochondria D. it requires carbon dioxide
A characteristic only shared by angiosperms and gymnosperms is
A. vascular tissue. B. fruit production. C. protection of the embryo. D. the production of seeds.
Which of these exhibits radial symmetry?
A) butterfly B) spoon C) snowflake D) shoe box
Which of the following statements correctly explains what it means for DNA replication to be bidirectional?
(a) The replication fork can open or close, depending on the conditions. (b) The DNA replication machinery can move in either direction on the template strand. (c) Replication-fork movement can switch directions when the fork converges on another replication fork. (d) The replication forks formed at the origin move in opposite directions.