The simplest type of antibody consists of
A) a single folded polypeptide chain.
B) 4 polypeptide chains, two heavy and two light.
C) 2 polypeptide chains, one large and one small.
D) 4 polypeptide chains of about equal size.
B) 4 polypeptide chains, two heavy and two light.
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Which of the following best describes the phylogenetic relationship between protists, fungi, plants, and
animals?
a. Fungi and animals share a common protist lineage, while plants arose from a different protist ancestor. b. Fungi and plants share a common protist lineage, while animals arose from a different protist ancestor. c. Animals and plants share a common protist lineage, while fungi arose from a different protist ancestor. d. Plants, animals, and fungi each arose from a different protist lineage. e. Plants, animals, fungi, and protists each arose from the same prokaryotic ancestor.
Cavener and Clegg (1981 ) demonstrated natural selection by observing the cumulative change in allele frequencies in populations of Drosophila melanogaster that were subjected to high levels of ________
A) mercury B) carbon dioxide C) alcohol D) sugar E) nitrous oxide
________ is the vascular tissue that conducts water and minerals from a plant's roots to its leaves.
a. Endosperm b. Phloem c. Hypha d. Corolla e. Xylem
The sodium-potassium pump is an example of:
A) active transport. B) receptor-mediated endocytosis. C) passive transport. D) facilitated diffusion.