The advantage of having a double circulation is that the ventricles may act as two pumps with an ability to deliver blood at different pressures. Which animals exhibit a "double circulation" and four-chambered hearts? Check all that apply.
_____ humans
_____ dogs
_____ crocodiles
_____ frogs
_____ birds
_____ turtles
__X__ humans
__X__ dogs
__X__ crocodiles
_____ frogs
__X__ birds
_____ turtles
You might also like to view...
The contacts between the DNA and the histones of the nucleosome are:
A. mainly between the R groups of the histones and the phosphate backbone of the DNA. B. mainly between the conserved histone folds and the bases that are exposed in the major groove of the DNA. C. mainly between the conserved histone folds and the bases that are exposed in the minor groove of the DNA. D. more prevalent in regions of the DNA that have tracts of G?C base pairs. E. primarily between the DNA and the histone peptide backbone.
Proto-oncogenes are
a. genes that will turn into cancer genes. b. normal genes that promote mitosis. c. genes that produce tumor suppressing proteins. d. cancer genes that back mutate into normal genes. e. normal genes that promote DNA replication.
What is apotosis?
a. a process in development where cells die back b. the condition of being without a particular sex c. a structure in birds and some lizards that functions as a penis d. a cellular process whereby a cell reproduces without mitosis or meiosis e. the term given to describe the formation of germ layers
Which of the following cells is a component of the body's first line defense?
A) monocyte B) goblet cell C) NK cell D) neutrophil E) microglial cells