September 20, 2020 |

PPSC Lecturer Biology Test 6 Online Preparation MCQs

Given below on this Website Online Free Taleem is free online MCQ’s test related to PPSC of Lecturer Biology. All the individuals who are going to appear in PPSC Lecturer of Biology written test can attempt these tests in order to prepare for it in best possible way. Our tests include all the important questions MCQs of Lecturer of PPSC Biology, all Past Papers of Lecturer of Biology PPSC that have extremely high amount of chances for been included in the actual exam which make our test undoubtedly the best source of preparation.

Note:-

There will be 25 multiple choice question in the test.
Answer of the questions will change randomly each time you start this test.
Practice this test at least 5 times if you want to secure High Marks.
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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

A characteristic common to all lipids is:

that they contain long chains of c-h bonds

that they have a glycerol backbone

all of these are characteristics of all lipids

that they are insoluble in water

2 / 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?

centrioles

centrosomes

the nuclear membrane

pericentriolar material

3 / 25

Nucleotides are the building blocks of:

RNA only

neither DNA nor RNA

both DNA and RNA

DNA only

4 / 25

A buffer exerts its effects because:

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

all of the above explain buffering effects

it absorabs H+ when the pH rises

it release H+ when the pH rises

5 / 25

Which statement about enzymes is not true?

they are sensitive to heat

they act to raise the activation energy of a reaction

they act to speed up a biochemical reaction

they are made up of RNA or protein

6 / 25

A red blood cell placed in a hypertonicv medium will:

have no change in shape

shrink

burst

expand

7 / 25

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

compound; organ

molecule; cell

atom; organ

atom; organism

8 / 25

Which of the following statements is not true?

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

ionic bonds can form between any two atoms

in NaCI, both sodium and chloride have electrons

molecules held together by ionic bounds

9 / 25

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

it is used to transport material out of the cell

it involves clathrin coated pits

It is not specific

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

10 / 25

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

table salt

paper

sugar

wax

11 / 25

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

consist of two or more polypeptide

have four amino acids

have a least four disulfide bridges

consist of four polypeptide subunits

12 / 25

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

CO2 and H2O

pyruvate

acetyl CoA

citrate

13 / 25

Why does carbon form covalent bonds?

because the most common isotope has four neutrons

because carbon has a high electronegativity

becasue carbon to balance the charge of its protons

because carbon needs four electrons to fill its outer shell

14 / 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

15 / 25

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

once

never

twice

many times

16 / 25

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

transmembrane proteins

cell surface proteins

carbohydrate chain

phospholipids

17 / 25

Endocytosis is an example of:

osmosis

facilitated diffusion

diffusion

bulk transport

18 / 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 guanine

adenine forms two hydrogen bonds with thymine

adenine forms two hydrogen bonds with uracil

cytosine forms two hydrogen bonds with thymine

19 / 25

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

stop using the glyphosate entirely

use crop rotation to ensure nutrient cycling

find a way to eradicate all unwanted plant species

periodically stop or change the type of pesticide being used

20 / 25

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

A). C₃H₈

B). C₂H₆

C). CH₄

D). C2H₂

21 / 25

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

22 / 25

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

runs for a longer period of time

used twice as many experimental subjects

does not have the variable being tested

has more of the variable being test

23 / 25

Most CO2 from catabolism is released during:

the Krebs cycle (citric acid cycle)

electron transport

lactate fermentation

glycolysis

24 / 25

Coenzymes differ from enzymes in that coenzymes are:

higher in energy state

polymers of amino acids

non protein organic molecules

active only outside the cell

25 / 25

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

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

is wild speculation

has been proven true

likely to never change

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