The simplest living vertebrates are the _______.
a) monotremes and marsupials
b) echinoderms and annelids
c) hagfishes and lampreys
d) salamanders and caecilians
Ans: c) hagfishes and lampreys
You might also like to view...
How are B-cell receptors different from T-cell receptors?
a. B-cell receptors bind antigen, while T-cell receptors do not. b. B-cell receptors have a more complex structure. c. B-cell receptors have a more simple structure. d. B-cell receptors are bound to the cell membrane, while T-cell receptors are bound to the nuclear membrane. e. B-cell receptors stimulate the production of a clone of cells.
Live birth is characteristic of:
a. marsupials only b. monotremes only c. placentals only d. marsupials and placentals e. birds only
Four of the five answers listed below affect blood glucose level. Select the exception
a. calcitonin b. glucagon c. glucocorticoid d. insulin e. epinephrine
Sexual reproduction reorganizes genetic material but doesn't create it; how does new genetic information appear in a population?
A) from the fusion of chromosomes from two individuals B) from chromosome-sorting errors in mitosis C) permanent changes, called mutations, alter the molecular structure of a gene D) from the pairing and sorting of different alleles E) from the union of two gametes, each produced within a separate individual