Biology I #2 Latest Actual Exam With Verified Questions & Correct Answers

BIOLOGY I #2 LATEST ACTUAL EXAM WITH VERIFIED
QUESTIONS & CORRECT ANSWERS

Question 1.
cell theory

ANSWER
the cell is the fundamental unit of life in all organisms & cells come only from preexisting cells


Question 2.
key functions of lipids

ANSWER
makes up cell membrane, energy storage


Question 3.
2 primary functions of the cell membrane

ANSWER
1. define cell boundary
2. regulation of molecules


Question 4.
main components of the cell membrane

ANSWER
- lipids
- proteins
- carbohydrates


Question 5.
what contributes to the fluidity of a membrane?

ANSWER
lipid types & characteristics of fatty acid chains






,Question 6.
amphipathic

ANSWER
having both hydrophilic & hydrophobic regions


Question 7.
which part of a phospholipid is hydrophilic?

ANSWER
head




Question 8.
which part of a phospholipid is hydrophobic?

ANSWER
fatty acid tails




Question 9.
main function of a phospholipid

ANSWER
forms the cell membrane






,Question 10.
lipid bilayer

ANSWER
2 layers of lipids


Question 11.
which part of the phospholipid is tucked inside the membrane?

ANSWER
nonpolar, hydrophobic tail




Question 12.
why is the polar part of the phospholipid fac ing outward?

ANSWER
can form bonds
-


Question 13.
liposome

ANSWER
spherical bilayer structure
- forms in aqueous environment at neutral pH






, Question 14.
why is pH important?

ANSWER
ensures polar head is in ionized form--makes them hydrophilic


Question 15.
van der Waals forces

ANSWER
weak binding of temporarily polarized molecules due to attraction of opposite charges
- helps w/ sticking of cholesterol/phospholipids in a cell membrane


Question 16.
saturated fats

ANSWER
- NO carbon=carbon double bonds
- straight structure
- tight packing --> reduces mobility (fluidity)