Question

QUESTION 29

1. In a synapse, neurotransmitters do not keep bonding to receptors over and over because:

   	A.	they are non polar molecules
   	B.	the receptors are quickly removed
   	C.	scientists do not know
   	D.	they are quickly removed or broken down by an enzyme
   	E.	neurotransmitters do not bond to receptors

1.5 points   

QUESTION 30

1. In the cell, proteins that are synthesized by the cell, are normally  produced  directly by (what organelle makes a protein)

   	A.	the ribosomes
   	B.	the mitochondria
   	C.	the nuclear membrane
   	D.	the plasma membrane
   	E.	the smooth endoplasmic reticulum

1.5 points   

QUESTION 31

1. In which one of the following blood vessels is blood under the lowest pressure? (think of the last place for blood before it's returned to the heart)

   	A.	arteriole
   	B.	artery
   	C.	vein
   	D.	capillary
   	E.	venule

1.5 points   

QUESTION 32

1. Interferon is a protein  produced by a virus to kill the host cell.

   		True
   		False

1.5 points   

QUESTION 33

1. Isotopes of an element like carbon have the same ________________________, but different _____________________.

   	A.	number of protons,   number of neutrons
   	B.	name,      chemical symbols
   	C.	number of neutrons,    numbers of protons
   	D.	atomic mass,     atomic numbers
   	E.	number of electron shells,   numbers of protons

1.5 points   

QUESTION 34

1. Lipids are important to biological systems because

   	A.	all lipids are very soluble in water
   	B.	they are able to store and transmit genetic information
   	C.	some lipid types are potentially large sources of energy to perform cellular work
   	D.	most help to buffer aqueous solutions in the body

1.5 points   

QUESTION 35

1. Living organisms maintain a fairly constant internal environment, this is known as

   	A.	evolution
   	B.	homeostasis
   	C.	biology
   	D.	chemistry
   	E.	metabolism

1.5 points   

QUESTION 36

1. Mitosis differs from meiosis in that  only mitosis

   	A.	involves two successive cell divisions
   	B.	is preceded by interphase
   	C.	involves the pairing of homologous chromosomes during prophase I
   	D.	results in the production of haploid cells
   	E.	results in cells that are genetically identical to the original cell

1.5 points   

QUESTION 37

1. Molecules of life (the basic biological molecules) include which one of the following?

   	A.	proteins, lipids, nucleic acids, carbohydrates
   	B.	nonsugar carbohydrates, proteins, lipids
   	C.	any noncarbon base molecule
   	D.	proteins, saturated fats, monosaccharides, but not polysaccharides
   	E.	lipids and proteins only

1.5 points   

QUESTION 38

1. Molecules such as water are referred to as ________ because they are electrically neutral overall but still have  partially charged regions.

   	A.	electrolytes
   	B.	ionically charged
   	C.	polar molecules
   	D.	ions
   	E.	isotopes

1.5 points   

QUESTION 39

1. Most  eukaryotic cells have a  membrane-bound ________ that  contains the genetic material.

   	A.	lysosome
   	B.	nucleus
   	C.	cell wall
   	D.	cytoplasm
   	E.	plasma membrane

Answer 1

QUS NO 29:- D degraded or deactivated by enzymes

QUS NO 30:- A THE RIBOSOME AND RER MAKES PROTINE

QUS NO 31:- C VAIN

QUS NO 32:- FALSE

Interferon is a protein produced by a host cell to kill the virus

QUS NO 33:- A. number of protons,   number of neutrons

QUS NO 34:- A AND D BOTH

QUS NO 35:-B homeostasis.

The process by which living organisms maintain a fairly constant internal environment despite changes in the external environment is known as. homeostasis.

QUS NO 36:- D. results in the production of haploid cells

QUS NO 36:-A.proteins, lipids, nucleic acids, carbohydrates

QUS NO 36:- C polar moleculE

QUS NO 36:- B NUCLES MOST EUCROYTIC HAVE MEMBRAIN BOUND NEUCLES THAT CONTAINT GENETIC METERIAL