FREE BIOLOGY AND STUDY GAMES ABOUT BIO 141 LAB

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FREE BIOLOGY AND STUDY GAMES ABOUT BIO 141 LAB

EXAM 1

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -74 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: What is an inhibitor?

Answer:

chemical that shuts off the activity of specific enzymes. Can be competitive or noncompetitive

Question 2: Epithelial cells functions and parts (3)

Answer:

Outside of animals, protect animals from water loss, mechanical injury, foreign invaders, and line interior cavities and ducts in animals

Parts: nucleus, cytoplasm, cell membrane

Question 3: What is responsible for the browning of fruits?

Answer:

Catechol melanin (Benzoquinone)

Question 4: What is the difference between aggregate and a colony?

Answer:

Aggregate: no evident interactions b/w cells

Colony: collection of cells and found in repetitive numbers of organizations

Question 5: Which one is multicellular?

1) amoeba 2) Trichtonympha 3) Elodea 4) Protococcus

Answer:

3

Question 6: What are enzymes? What makes up enzyme substrate complex?

Answer:

An enzyme is a biological catalyst that speed up a reaction without being consumed by the reaction.The substrate-enzyme complex is made up of an active site with the substrate bound in this site on the enzyme

Question 7: What was the competitor? Was it competitive or non competitive?

Answer:

PTU- phenylthiourea. It was noncompetitive

Question 8: Identify an amoeba. How does it digest food?

Answer:

Phagocytosis Question 9: When preparing a test tube in enzyme labs, why wait until last moment to add substrate?

Answer:

Because the reaction begins when the substrate and enzyme come into contact

Question 10: What are the parts of an amoeba? Is it multi or unicellular?

Answer:

Cell membrane, ectoplasm (inside cell membrane), endoplasm, contractile vacuole, food vacuole, nucleus, pseudopodia

Question 11: Which microscope is used for studying cells and tissues?

Answer:

Scanning Electron Microscope (SEM)

Question 12: What color does starch turn in I2KI?

Answer:

black

Question 13: Which microscope can see ribosome and ER?

Answer:

Electron microscope

Question 14: What are cofactors? Coenzymes?

Answer:

Cofactors are nonprotein substances that the enzyme needs to bond in order for the enzyme to function Coenzymes are organic cofactors Question 15: Which type of microscope focuses a beam of electrons through a specimen and magnifies objects greatly? (100-1000x)

Answer:

Transmission Electron Microscope (TEM)

Question 16: Define enzymes

Answer:

biological catalysts that speed up a reaction by lowering the Ea of a reaction and do not get consumed or altered by a reaction Question 17: What's the difference between a controlled variable and a control treatment?

Answer:

Control variable: a variable kept constant between treatment groups

Control treatment: level oft treatment that serves as a benchmark, usually not manipulated

Question 18: What criteria must exist in a hypothesis

Answer:

must be testable, well defined, and falsifiable

Question 19: The distance between the eyepieces

Answer:

inter-pupillary distance

Question 20: What inhibits catechol oxidase? Is it competitive or non-competitive?

Answer:

PTU- Phenylthiourea. Non-competitive

Question 21: What is the formula of the reaction for catechol?

Answer:

Catechol + O2 --> (catechol oxidase)--> Benzoquinone + H2O

Question 22: Independent variable definition

Answer:

One variable or experimental condition to manipulate change Question 23: Is Scenedesmus aggregate or colonial? What are the parts of Scenedesmus?

Answer:

Colonial, groups of 4-8 Spines, cell wall, vacuole, chloroplast, nucleus (looks like a space alien/snowman) aquatic green algae

Question 24: What 2 enzymes were studied in the enzyme lab?

Answer:

• Amylase
• catechol oxidase

Question 25: Which one(s) is/are eukaryotic?

• elodea
• protoccocus
• cheek cells
• volvox

Answer:

all

Question 26: What solution is used when preparing slides of Trichtonympha

Answer:

insect ringers (75% NaCl), isotonic to internal environment of insects