Select the statement that correctly describes differences among these four types of algae.
A. Chlamydomonas reinhardtil and Gonium pectorale cells are biflagellate, Pleodorina californica and Volvox have no biflagellate cells.
B. Chlamydomonas reinhardtil is single celled and biflagellate, while Gonium pectorale, Pleodorina californica and Volvox are multicellular with a single flagella on all cells.
C. Chlamydomonas reinhardtil is single celled, Gonium pectorale is composed of identical cells, and Pleodorina californica and Volvox are composed of two different cell types.
D. Gonium pectorale is single celled, Chlamydomonas reinhardtil is composed of identical cells, and Pleodorina californica and Volvox are composed of two different cell types.
E. Chlamydomonas reinhardtil and Gonium pectorale cells lack flagella, while Pleodorina californica and Volvox have biflagellate somatic cells.
C. Chlamydomonas reinhardtil is single celled, Gonium pectorale is composed of identical cells, and Pleodorina californica and Volvox are composed of two different cell types.
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The outermost layer of membranes surrounding the brain and spinal column is the:
a. dura mater. b. meninges. c. arachnoid. d. pia mater.
Which of the following is the best description of the form of an exoskeleton?
a. spines extending from the surface b. plates under the skin c. hollow, rigid tubes d. interior columns e. fluid-filled bags
Which of the following techniques is most commonly used in the prenatal diagnosis of genetic disorders, such as cystic fibrosis, in a human fetus?
A) Chorionic villus sampling B) Isolation of fetal cells from maternal blood C) Amniocentesis
Which is the best example of physical weathering?
1. the formation of a sandbar along the side of a stream 2. the cracking of a rock caused by the freezing and thawing of water