Clays often have positively-charged surfaces. How may this have been important in the formation of organic macromolecules?
A. They are a source of ATP to run chemical reactions.
B. They form covalent bonds with organic building blocks.
C. They can form templates by binding organic building blocks.
D. They are a source of oxygen to break down organic building blocks.
E. They are formed from meteorites that carried organic molecules to Earth.
Answer: C. They can form templates by binding organic building blocks.
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Cells undergo exocytosis ____
a. to pump protons down a concentration gradient b. when replicating c. to secrete protein and wastes from the cell d. to ingest nutrients e. as a means of cellular protection
Which is a risk that must be assumed when we genetically engineer a living individual? a. On which chromosome will the virus integrate the injected gene
b. The inserted gene may disrupt the normal genetics of the cell. c. All are risks associated with gene therapy. d. Development of an allergic reaction to the viral vector. e. Cancer may be the result of the inserted gene.
The single strand of mRNA that is produced during transcription has the same polarity as the ________ strand of DNA
A) template B) nontemplate C) leading D) lagging E) nonsense
What is formed by the three layers of tissue that include the endoderm, mesoderm, and ectoderm?
A) zygote B) blastocyst C) gastrula D) fetus