While it was a diverse group in the Mesozoic, the tuatara is one of only two living members of this
lineage.
a. Testudines
b. Archosauromorpha
c. Squamata
d. Sphenodontia
e. Amphibia
D
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The statements about transport of Ca2+ from the cytosol (low Ca2+ concentration) into the endoplasmic reticulum (high Ca2+ concentration) are true EXCEPT which of the following?
A. Calcium movement involves the use of a pump. B. Calcium movement involves active transport. C. Calcium movement occurs by facilitated diffusion using a transporter protein. D. Calcium movement requires energy. E. Calcium movement occurs through a transmembrane protein.
Walking through the botanical garden with a friend, you spy a rare and beautiful variety of Hosta. "Oh I would love to have one of those!" you exclaim. "But they cost a king's ransom." Your friend smiles, snips off a tiny piece of the shoot, and says, "I'll grow you one. I'll just take it back to lab and..."
Ranking Questions __ "wait for somatic embryos to form..." __ "grow up a callus..." __ "culture an individual plantlet for you..." __ "use enzymes to break down the cell walls..."
Which statement about the cell cycle is not true?
a. It consists of interphase, mitosis, and cytokinesis. b. The cell's DNA replicates during G1. c. A cell can remain in G1 for weeks or much longer. d. DNA is not replicated during G2. e. Cells enter the cell cycle as a result of internal or external signals.
A healthy male will release ____ sperms during one ejaculation.
A. 300 B. 3,000 C. 30,000 D. 300,000,000