FPSC Lecturer Biology past papers

PPSC Lecturer Biology Test 6 Online Preparation MCQs

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There will be 25 multiple choice question in the test.
Answer of the questions will change randomly each time you start this test.
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Test Instructions:-
Test Name	Lecturer Biology
Subject	Biology Test 6
Test Type	MCQs
Total Questions	25
Total Time	20 Minutes
Total Marks	100

You have 20 minutes to pass to the quiz.

PPSC Lecturer of Biology Practice Test 6

1 / 25

For a protein to have a quaternary structure, it must:

have a least four disulfide bridges

consist of four polypeptide subunits

consist of two or more polypeptide

have four amino acids

2 / 25

A control experiment has all of the conditions identical to the primary experiment except that it:

used twice as many experimental subjects

does not have the variable being tested

has more of the variable being test

runs for a longer period of time

3 / 25

A characteristic common to all lipids is:

that they have a glycerol backbone

all of these are characteristics of all lipids

that they contain long chains of c-h bonds

that they are insoluble in water

4 / 25

Which of the following is an example of a hydrophobic material?

wax

sugar

table salt

paper

5 / 25

A red blood cell placed in a hypertonicv medium will:

shrink

expand

burst

have no change in shape

6 / 25

An element is to a an............as a tissue is:

atom; organism

molecule; cell

compound; organ

atom; organ

7 / 25

When scientists talk about a scientific theory, they are talking about something that:

is wild speculation

likely to never change

has been proven true

has been tested frequently and is supported by a lot of evidence

8 / 25

Which of these dydrocarbons has a double bond in its carbon Skelton?

A). C₃H₈

B). C₂H₆

C). CH₄

D). C2H₂

9 / 25

Endocytosis is an example of:

diffusion

facilitated diffusion

osmosis

bulk transport

10 / 25

A buffer exerts its effects because:

it release H+ when the pH rises

all of the above explain buffering effects

it absorabs H+ when the pH rises

it absorbs or release H+ ions reversibly to resists a pH change within its buffering range

11 / 25

What appears to be the best solution currently for helping to reduce the likelihood of evolutionary tolerance?

periodically stop or change the type of pesticide being used

stop using the glyphosate entirely

find a way to eradicate all unwanted plant species

use crop rotation to ensure nutrient cycling

12 / 25

How often can a sucrase molecule be used to hydrolyze sucrose?

pyruvate

acetyl CoA

CO2 and H2O

citrate

13 / 25

Which of the following statements about receptor-mediated endocytois is true?

it is used to transport material out of the cell

It is not specific

it involves clathrin coated pits

it involves transport of material into the cell through pores in the cell membrane

14 / 25

How many molecules of CO2 are produced for each molecule of glucose that passes through glycolysis and the Krebs cycle (citric acid cycle)?

15 / 25

The two strands of a DNA molecule are held together through base-pairing. Which of the following best describes the base-pairing in DNA:

cytosine forms two hydrogen bonds with thymine

cytosine forms two hydrogen bonds with guanine

adenine forms two hydrogen bonds with uracil

adenine forms two hydrogen bonds with thymine

16 / 25

Select the membrane molecule that is made up of a polar region with two nonpolar fatty acids tails:-

transmembrane proteins

carbohydrate chain

phospholipids

cell surface proteins

17 / 25

Why does carbon form covalent bonds?

because carbon has a high electronegativity

because carbon needs four electrons to fill its outer shell

becasue carbon to balance the charge of its protons

because the most common isotope has four neutrons

18 / 25

How often can a sucrase molecule be used to hydrolyze sucrose?

never

many times

once

twice

19 / 25

Most CO2 from catabolism is released during:

the Krebs cycle (citric acid cycle)

glycolysis

electron transport

lactate fermentation

20 / 25

Nucleotides are the building blocks of:

RNA only

DNA only

neither DNA nor RNA

both DNA and RNA

21 / 25

Which of the following statements is not true?

molecules held together by ionic bounds

ionic bonds can form between any two atoms

a sodium atom is able to form an ionic bond with chloride becausesodium gives up an electron and chloride gains and electron

in NaCI, both sodium and chloride have electrons

22 / 25

Coenzymes differ from enzymes in that coenzymes are:

non protein organic molecules

higher in energy state

polymers of amino acids

active only outside the cell

23 / 25

A covalent bond is:

the transfer of electrons from one atom to another

a sharing of electrons between two atoms

an example of a bond that results in ionic compounds

an attraction of charged atoms

24 / 25

Which statement about enzymes is not true?

they act to speed up a biochemical reaction

they are sensitive to heat

they are made up of RNA or protein

they act to raise the activation energy of a reaction

25 / 25

Eukaryotes must organize their microtubules, especially during cell division. What region is responsible for serving as the microtubule organizing center for all eukaryotic cells?

pericentriolar material

centrosomes

centrioles

the nuclear membrane

Your score is

The average score is 45%

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