practice questions Flashcards
compounds that minimize pH changes in a solution are called?
Buffers
____ substances dissolve in water whereas ____substances do not?
hydrophilic,hydrophobic
The normal physiological pH of human blood is?
7.4
which one of the following is not a monosaccharide?
lactose
triglycerides are storage forms of?
lipids
which of the following is not present in the cell plasma membrane?
nucleic acids
DNA stands for?
deoxyribonucleic acid
both DNA and RNA contain all of the following except?
amino acids
extracellular fluid (ecf) is composed of plasma and ____?
intercellular fluid
_____ is a process by which the internal body environment is maintained within relatively narrow limits (relatively constant and unchanging)
homeostasis
successful coping of an organism with its environment is called?
aqdaptation
_____ are sites of protein sysnthesis?
rough endoplasmic reticulum
____ are sites of lipid synthesis?
smooth endoplasmic reticulum
energy for functioning of biological cell is produced by?
mitochondria
the process of ____ takes place in the _____?
transcription,nucleous
the process of water moving from region of high to low water concentration is called?
active transport
active transport is different from facilitated diffusion in that active transport requires:
ATP (exam question)
if a normal cell is placed in hypertonic solution it?
shrinks
in _____,the ion and the substance are transported across the membrane in opposite directions?
counter-transport
pick the correct statement?
ECF contains more sodium ions compared to ICF
active transport is similar to facilitated diffusion in that active transport also
requires a carrier protein
Basement membrane of the cells is generally a thin layer made of _____lying under the epithelial tissue?
carbohydrate
which one of the following cell components is not directly involved in the process of protein synthesis?
mitochondria
pick the false statement?
opening of chloride channels in the plasma membrane of cells will lead to the departure of this ion from the cell
an ion :
is formed when an atom loses electrons
is formed when an atom gains electrons
can be negatively or positively charged
AB + CD —————- AC + BD
this a _______ reaction
exchange
the sequence of 3 bases on the mRna molecule that codes for a specigic amino acid is called?
codon
all enzymes are made of proteins? this statement is?
always true
