Q: What is used to date older fossils? Choices: - search engines - litmus testing - electron microscopes - radioactive isotopes A:
radioactive isotopes

Q: Carbon is a nonmetal with a significantly higher electronegativity; it is therefore more likely to accept electrons in what kind of reaction? Choices: - reversable reaction - catalyst reaction - isotope reaction - redox reaction A:
redox reaction

Q: Q: Chemical formulas for ionic compounds are called what? Choices: - electronic formulas - velocity formulas - magnetic formulas - ionic formulas A:
A: ionic formulas

Question: Q: Deleting or inserting a nitrogen base causes what? Choices: - a placentation mutation - a degenerative mutation - a photoinhibition mutation - a frameshift mutation A:
Answer: a frameshift mutation

*Question*
Q: What is a rigid layer that surrounds the plasma membrane of a plant cell? Choices: - the nucleic wall - the cell center - mitochondria - the cell wall A:
**Answer**
the cell wall

(Q).
Q: Plasmodesmata passes through what part of plants? Choices: - nucleus - cell ridges - cytoplasm - cell walls A:
(A).
cell walls