BIO250 Exam 3 (A+++ Answer)

Question 1

All of the following pertain to glycolysis except

Select one:

a. Occurs without oxygen

b. Ends with formation of pyruvic acid

c. Occurs during fermentation

d. Degrades glucose to CO2 and H2O

e. Involves reduction of NAD

Question 2

A screening system called the _____ test is used for detecting chemicals with carcinogenic potential.

Select one:

a. Koch

b. Ames

c. Mutation

d. Cancer

e. Iowa

Question 3

The operon segment composed of the gene that code for a protein repressor is called the

Select one:

a. Operator

b. Structural locus

c. Regulator

d. Promoter

e. None of the choices are correct

Question 4

Halo bacteria regulate osmotic pressure by

Select one:

a. Releasing salt to the environment

b. Absorbing salt from the environment

c. Excluding salt from the environment

d. Changing their cell wall to provide additional osmotic protection

e. None of the choices are correct

Question 5

Facilitated diffusion is limited by

Select one:

a. Substrate concentration

b. Carrier proteins in the membrane

c. Size of the pores in the membrane

d. Osmotic pressure

e. The size of the cell

Question 6

Enzymes that catalyze removal of carbon dioxide from a substrate are called

Select one:

a. Phosphotransferases

b. Oxidoreductases

c. Decarboxylases

d. Aminotransferases

e. Ligases

Question 7

In bacterial cells, when glucose is completely oxidized by all the pathways of aerobic cellular respiration, what is the maximum number of ATP generated?

Select one:

a. 2 ATP

b. 3 ATP

c. 24 ATP

d. 36 ATP

e. 38 ATP

Question 8

The following pertain to ribosomes during protein synthesis except

Select one:

a. Contain codons within their rRNA molecules

b. Participate only in translation

c. Bind to the 5' end of mRNA by their small subunit

d. Use their large subunit to supply enzymes for peptide bonding

e. Shift to the right along the mRNA strand from one codon to the next

Question 9

The methanogens, producers of methane gas, require environments that

Select one:

a. Have sunlight

b. Are very acidic

c. Have abundant oxygen and CO2

d. Are extremely cold

e. Are anaerobic with hydrogen gas and CO2

Question 10

All of the following could find a location in or on body tissues suitable for growth except

Select one:

a. Psychrophiles

b. Anaerobes

c. Facultative anaerobes

d. Mesophiles

e. Capnophiles

Question 11

The most serious type of mutation is a

Select one:

a. Point mutation

b. Silent mutation

c. Frame shift mutation

d. Back mutation

e. All the choices are equally serious

Question 12

Which of the following is not involved in the step that occurs between glycolysis and the Krebs cycle?

Select one:

a. Reduction of NAD

b. Decarboxylation of pyruvic acid

c. Coenzyme A attaches to an acetyl group

d. Dehydrogenation of pyruvic acid

e. Pyruvic acid accepts electrons from NADH

Question 13

All of the following pertain to nitrogenous bases except

Select one:

a. Form pairs by hydrogen bonding

b. Guanine pairs with uracil

c. Adenine pairs with thymine

d. Cytosine and thymine are pyrimidines

e. Allows variation from one nucleotide to another which creates the encoded information

Question 14

Which of the following additions have been made to principles of the central dogma of biology?

Select one:

a. DNA information cannot be converted into RNA information

b. Protein information can be converted into DNA information

c. RNA can be used to regulate gene function

d. All of these

Question 15

The reactions of fermentation function to produce _____ molecules for use in glycolysis.

Select one:

a. Pyruvic acid

b. ATP

c. NAD

d. NADH

e. Glucose

Question 16

The term heterotroph refers to an organism that

Select one:

a. Uses CO2 for its carbon source

b. Must depend on outside organic sources for their carbon needs

c. Gets energy from sunlight

d. Gets energy by oxidizing chemical compounds

e. Does not need a carbon source

Question 17

In addition to electrons, which of the following is also involved in electron transfer?

Select one:

a. ADP

b. Glucose

c. Carbon

d. Hydrogen

e. Carbon dioxide

Question 18

A permanent, inheritable change in the genetic information is called a/an

Select one:

a. Translation

b. Transcription

c. Mutation

d. Alteration

e. Regeneration

Question 19

Enzymes that can function at boiling water temperatures or other harsh conditions would be termed

Select one:

a. Denatured

b. Ribozymes

c. Abzymes

d. Exoenzymes

e. Extremozymes

Question 20

The term phototroph refers to an organism that

Select one:

a. Uses CO2 for its carbon source

b. Must obtain organic compounds for its carbon needs

c. Gets energy from sunlight

d. Gets energy by oxidizing chemical compounds

e. Does not need a carbon source