Amed has scaly skin due to the X-linked recessive condition icthyosis. He is ________ for the trait.
A) autosomal dominant
B) heterozygous
C) homozygous
D) hemizygous
D) hemizygous
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Which one of the following statements about the phylum Brachiopoda is false?
A. Brachiopods are often misidentified as bivalves. B. Brachiopods were much more diverse in the past. C. As in bivalves, the valves in brachiopods are lateral (left and right) to the body axis. D. Most brachiopods are sessile (attached). E. The lophophore resides within the brachiopod's shells.
In Figure 28-2, the zygote is the structure labeled:
a. 1.
b. 4.
c. 8.
d. 17.
e. 21.
Transmembrane proteins that span the membrane are
a. peripheral membrane proteins. b. covalently linked to membrane lipids. c. integral membrane proteins. d. ion transporters.
A base pair is a unit of DNA that consists of:
A) one nucleotide. B) two identical chromosomes. C) one sugar bonded to one phosphate. D) two nucleotides, one on each complementary strand of a DNA molecule. E) a single chromosome.