During which stage of development are germ cell layers first formed?
A. fertilization
B. cleavage
C. neurulation
D. gastrulation
E. organogenesis
D. gastrulation
You might also like to view...
What type of covalent bond between amino acid side chains (R-groups) functions in maintaining a polypeptide's specific three-dimensional shape?
A) ionic bond B) hydrophobic interaction C) van der Waals interaction D) disulfide bond E) hydrogen bond
When MSH2 and MLH1 are inactivated by mutation, DNA repair is defective and ____________________ mutation rates increase by at least 100-fold
Fill in the blank(s) with correct word
A homozygous recessive where “A” represents the
trait has two recessive alleles __________. Fill in the blank(s) with the appropriate word(s).
Which of the following is (are) true regarding whale
sensory systems? a. Like fishes, they use lateral line systems for navigation. b. Their jaws pick up sound vibrations in the water and transmit them to their middle ears. c. They collect sound waves using external ears. d. All whales have auditory canals leading to their middle ears. e. All of these are true.