Exam 2

Navigation » List of Schools » Los Angeles Trade Technical College » Biology » Biology 6 – General Biology I » Spring 2021 » Exam 2

Need help with your exam preparation?

Existing Quiz Clients Login here

Below are the questions for the exam with the choices of answers:

Try The Exam

Question #1

Describe a specific example of a signal molecule communicating with a target cell by type of response of the target cell.

A uptake of glucose inside the cell

B insulin

C tyrosine kinase receptor

Question #2

Describe a specific example of a signal molecule communicating with a target cell by type of receptor that matches it, if known.

A tyrosine kinase receptor

B uptake of glucose inside the cell

C insulin

Question #3

Describe a specific example of a signal molecule communicating with a target cell by the name of the signal molecule.

A uptake of glucose inside the cell

B insulin

C tyrosine kinase receptor

Question #4

Identify the enzyme that is responsible for genetically programmed & cell-regulated suicide.

A ATP synthase

B caspases

C rubisco

D catalase

Question #5

Identify the enzyme that remove phosphate to deactivate relay proteins during signal transduction.

A catalase

B phosphatase

C caspases

D ATP synthase

Question #6

Identify the enzyme that fixes (“attaches”) carbon dioxide to ribulose bisphosphate (RuBP) to initiate the Calvin cycle.

A ATP synthase

B rubisco

C phosphatase

D caspases

Question #7

Identify the enzyme that breaks down hydrogen peroxide into water & oxygen gas.

A phosphatase

B rubisco

C catalase

D caspases

Question #8

Identify the enzyme that covalently bonds inorganic phosphate to ADP from energy released when H+ diffuses back into mitochondrial matrix.

A phosphatase

B rubisco

C ATP synthase

D catalase

Question #9

Identify two molecules produced when Baker’s yeast cells are grown under anaerobic conditions

A active site

B metabolism

C lactic acid

D Carbon dioxide and alcohol

Question #10

Identify fermentation product when human cells do not get sufficient oxygen gas

A metabolism

B Carbon dioxide and alcohol

C lactic acid

D active site

Question #11

Identify chemical reactions in cells required by organisms to assimilate energy to be used for growth and reproduction

A Carbon dioxide and alcohol

B active site

C lactic acid

D metabolism

Question #12

Identify
“pouch-shaped” region on the surface of an enzyme where substrates dock and eventually get converted into products.

A metabolism

B Carbon dioxide and alcohol

C lactic acid

D active site

Question #13

The inflated balloon & foamy suspension from the bottle containing yeast, sugar & water indicated that _______________is occurring.

A fermentation

B signal transduction

C photosynthesis

D aerobic respiration

Question #14

Consider the experiment that tested the hypothesis that enzyme catalyzes chemical reactions. A tube with milk by itself and tube with milk with rennin (rennet) were set up. What was the independent variable?

A presence/absence of milk protein

B coagulation

C color of the solution inside the test tubes

D presence/absence of rennin (rennet)

Question #15

Use the given data to answer the next question:
Rf of A = 0.38 Rf of B = 0.45 Rf of C = 0.80 Rf of D = 0.98
Which was the most polar pigment?

A D

B A

C B

D C

Question #16

The bubbles released from the test tube containing liver & H2O2 were the result of the ____________________.

A release of O2 from the reaction

B H2O2 evaporating

C boiling of living tissues

D enzymes getting denatured

Question #17

Which observed evidence was used to support the hypothesis that chlorophyll is needed to produce starch?

A The dark purple areas (after iodine was added) were located in what used to be the green areas in the leaf.

B The dark purple areas (after iodine was added) were located in what used to be in the white edges in the leaf.

C Bubbles showed up after soaking the leaf in iodine solution.

D Coagulation occurred in the center of the leaf.

Question #18

Hot ___________ bath was used to extract (remove) the green pigment from the leaf.

A acetone & petroleum ether

B iodine

C water

D alcohol

Question #19

Which was the most nonpolar pigment?

A purple anthocyanin

B yellow green chlorophyll b

C grass green chlorophyll a

D yellow carotene

Question #20

Baker’s yeasts ferment sugar for what purpose?

A to release energy needed to make ATP

B to convert sugar into starch

C to prepare the cell for aerobic respiration

D to produce carbon dioxide & alcohol

Question #21

What is the role of the sugar in the lab exercise that combined it with water & yeast? It was the ____________________.

A intermediate

B substrate

C product

D enzyme

Question #22

Which evidence demonstrated that enzymes catalyze chemical reactions?

A Only the tube with starch by itself turned orange when tested with Benedict’s.

B All tubes tested with Benedict’s reagent turned orange in color.

C Only the tube with starch & saliva combined turned orange when tested with Benedict’s.

D All tubes tested with iodine remained blue/black in color.

Question #23

In the lab exercise on cell respiration in peas, the vial with __________ was a control for the possible unexpected changes in gas volume not related to cell respiration.

A soaked peas only

B dry peas & beads

C beads only

D soaked peas & beads

Question #24

_________________ catalyzes the reactions that phosphorylate proteins during the signal transduction pathway.

A Catalase

B Phosphatase

C Protein kinase

D Second messenger

Question #25

Which type of signaling molecules tend to have intracellular receptors?

A local regulators

B small & polar such as Ca ions

C lipid-based such as steroids

D peptide-based such as insulin

Question #26

Which one best explains the fact that most signal transduction pathways have multiple (cascade) steps?

A Each step can be activated by several G proteins simultaneously.

B Multiple steps provide for greater amplification of a signal.

C Each of the steps allow for flexible response.

D Multiple steps in a pathway require the least amount of ATP.

Question #27

Key to the cell’s continuing “receptiveness” to regulation is the _________________________.

A role of cyclic AMP and calcium ions in signal transduction

B type of receptors the cell uses for communication

C presence of enzyme inhibitors

D reversibility of the binding of signaling molecules to their receptors

Question #28

A pair of tyrosine kinases (that form a dimer) embedded in the plasma membrane serve as___________ of the signal pathway.

A second messenger

B receptors

C relay protein

D hormone

E local regulator

Question #29

A hormone binds with a G protein-coupled receptor of a target cell. What immediately happens next?

A The target protein is deactivated.

B A relay protein is phosphorylated.

C Hormone replaces GTP with ATP in the G protein

D Conformational change in the receptor activates the G protein.

Question #30

________________ is the enzyme that converts ATP into cyclic AMP, an important second messenger during signal transduction.

A Catalase

B Adenylyl cyclase

C Kinase

D Caspase

Question #31

Which is a substrate of the light-dependent reaction (linear electron flow) of photosynthesis?

A glucose

B water

C ATP

D NADPH

Question #32

Which molecules coming from the light dependent reactions of photosynthesis are utilized in the Calvin cycle?

A CO2 and glucose

B ADP and NADP+

C H2O and O2

D ATP and NADPH

Question #33

Photosynthesis involves the conversion of ____________________.

A carbon dioxide int oxygen gas

B light into chemical energy

C glucose into lactic acid

D light into oxygen gas

Question #34

When stomates are closed, which molecule accumulates inside the leaves undergoing photosynthesis? This condition may harm plants.

A water

B oxygen gas

C glucose

D carbon dioxide

Question #35

The leaves of a plant being green implies __________________________.

A green light is absorbed by the leaves

B photosynthesis must occur in plant leaves

C photosynthesis uses green light as a source of energy

D leaves are colored green under light & dark conditions

Question #36

CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they ___________________________.

A fix CO2 into organic acids during the night

B use a different enzyme which outcompetes rubisco for CO2

C fix CO2 in mesophyll cells then export intermediates to the bundle-sheath cells where CO2 is recovered

D fix CO2 into pyruvate in leaf epidermal cells

Question #37

In the thylakoid membrane, what is the main direct role of antenna pigment molecules in photosystems I & II?

A harvest light & transfer energy to the reaction-center special chlorophyll a

B synthesize sugar from carbon dioxide & water

C split water and release oxygen gas

D synthesize ATP from ADP and phosphate

Question #38

Which event does NOT occur during glycolysis?

A glucose is broken down into 2 three-carbon sugar

B energy is released to produce ATP

C pyruvate is converted into lactic acid

D intermediates get oxidized by NAD+

Question #39

In human cells, what ultimately happens to the high energy electron released during glycolysis if the person is not able to breathe properly?

A It is used as a raw material to synthesize fat molecules.

B It enters the mitochondria to combine with oxygen gas

C It combines with pyruvate to produce a fermentation product

D It gets reused & goes through glycolysis a second time.

Question #40

Where in the cell do Krebs cycle & Electron transport chain occur?

A cytoplasm

B plasma membrane

C chloroplast

D nucleus

E mitochondrion

Question #41

In the absence of sugars, cells may use fats as fuel for respiration. Where do the 2-carbon catabolic products of fatty acid breakdown enter the aerobic respiration pathway?

A Krebs cycle

B Electron transport chain & chemiosmosis

C Glycolysis

D Calvin cycle

Question #42

From “energy” perspective, which statement best describes the relationship between photosynthesis and respiration?

A Photosynthesis stores energy in complex organic molecules, whereas respiration releases it.

B Photosynthesis occurs only in plants and respiration occurs only in animals.

C ATP molecules are produced in photosynthesis and used up in respiration.

D Respiration runs the biochemical pathways of photosynthesis in reverse.

Question #43

Which process in eukaryotic cells will proceed normally whether oxygen gas (O2) is present or absent?

A Krebs (Citric acid) cycle

B Oxidative phosphorylation

C Electron transport chain

D Glycolysis

Question #44

Which event happens during Krebs (Citric acid) cycle?

A The product of glycolysis is further broken down to release more energy.

B Glucose is split into two pyruvates.

C Oxygen gas is used to make carbon dioxide.

D Glucose is synthesized using ADP & phosphate

Question #45

High amounts of __________ are able to turn off aerobic cell respiration.

A glucose and pyruvate

B H2O and O2

C NAD+ and FAD+

D ATP and citric acid

Question #46

The action of enzymes is noncompetitively (allosterically) inhibited by certain poisons by _____________.

A stabilizing the protein subunits of the enzymes

B pulling the substrates away from the enzyme

C binding to the enzyme and modifying the shape of the enzyme’s active site

D filling the active sites and thus preventing the normal substrate to bind with the enzyme

Question #47

ATP is synthesized in all of the following metabolic pathways except ______________________.

A light-dependent reactions (cyclic & noncylcic electron flow) of photosynthesis

B Electron transport chain & chemiosmosis

C Krebs (Citric acid) cycle

D glycolysis

E light-independent reactions (Calvin cycle) of photosynthesis

Question #48

Which statement is true regarding life and the second law of thermodynamics (law of entropy)?

A As a consequence of being alive, organisms convert “useful” energy into dissipated (high entropy) heat.

B Living organisms do not actually obey the law of entropy.

C Living organisms decrease entropy in the universe while alive but increase entropy after they die.

D Life obeys the second law of thermodynamics but not the first law of conservation of energy.

Question #49

Consider the metabolic pathway “ A -> B -> C -> D ”.
How many different kinds of enzymes are required to complete the metabolic pathway?

A 4

B 3

C 1

D 2

E 5

Question #50

When cell processes require energy to do work, ___________________________.

A Cell respiration enzymes are inhibited

B High energy phosphate bond breaks off from ATP

C ADP & phosphate are covalently bonded to make ATP

D ATP gets converted to cyclic AMP & pyrophosphate

Question #51

Consider an energy-requiring metabolic pathway:
A -> B -> C -> D
Which statement is false?

A It is a anabolic.

B A is the initial substrate whereas D is the final product of the pathway.

C B & C are intermediates of the pathway.

D D is much smaller than A.

Question #52

An enzyme is specific to its substrate because _________________________.

A its subunit molecules need to match the subunit molecules of the substrate

B it has to be the same size as the substrate

C its polarity has to be similar to the product’s polarity

D the shape of its active site has to match the shape of the substrate

Try The Exam

Fresh Grad Lands Job as Real Estate Agent With Help from Professional Writers

Need help with your exam preparation?

Below are the questions for the exam with the choices of answers:

Christian S.

Tyra

Linda

Manush

We accept payment