Jan van Helmont concluded that plants gain most of their mass from
a) water.
b) the soil.
c) carbon dioxide in the air.
d) oxygen in the air.
Ans: a) water.
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Order the following structures (layers) that a small molecule must pass through as it moves from outside of an encapsulated gram negative cell to the cytoplasm. _____ Periplasm and Peptidoglycan _____ Plasma membrane _____ Capsule _____ Outer membrane
Fill in the blank(s) with the appropriate word(s).
During an acrosome reaction, the acrosome:a
detaches, allowing the sperm to penetrate the egg. b. releases enzymes that digest the outer layer of the egg. c. secretes calcium ions, which cause the sperm to fuse with the egg. d. releases bindin, which causes the sperm to bind to the egg. e. secretes a chemical that attracts the egg to the sperm.
All of the following contain amino acids EXCEPT _____
A) hemoglobin B) cholesterol C) enzymes D) insulin
For most metazoans, what is the name of the innermost tissue layer during development?
a. mesoderm b. epiderm c. endoderm d. ectoderm