Questions 111–120 of 366. Imported answers require independent review unless marked reviewed.

Topic practice 366 questionsPage 12 of 37

Question 8

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The information contained in DNA is used to synthesise proteins that are necessary for the functioning of life. DNA is composed of four nucleotides: Adenine (A), Thymine (T), Cytosine (C), and Guanine (G). The information contained in DNA can then be thought of as a sequence of these four nucleotides: A, T, C, and G. DNA has coding and non-coding regions. Coding regions—where the sequence of these nucleotides are read in groups of three to produce individual amino acids—constitute only about 2% of human DNA. For example, the triplet of nucleotides CCG codes for the amino acid glycine, while the triplet GGA codes for the amino acid proline. Multiple amino acids are then assembled to form a protein.
Based only on the information provided above, which of the following statements can be logically inferred with certainty?
(i) The majority of human DNA has no role in the synthesis of proteins. (ii) The function of about 98% of human DNA is not understood.
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Question 9

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Which one of the given figures P, Q, R and S represents the graph of the following function?
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Question 10

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An opaque cylinder (shown below) is suspended in the path of a parallel beam of light, such that its shadow is cast on a screen oriented perpendicular to the direction of the light beam. The cylinder can be reoriented in any direction within the light beam. Under these conditions, which one of the shadows P, Q, R, and S is NOT possible?
Diagram for Mathematics question 10

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Question 11

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Let

be defined by

and

for all

. Consider the following statements: P:

has a saddle point at

. Q:

has a saddle point at

. Then
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Question 12

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Let

be a topological space with the usual topology and

denote the set of rational numbers. Define the subspaces

and

of

as follows:

;

;

;

. Which of the following statements is correct?
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Question 13

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Let

,

,

. Then

is equal to
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Question 14

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Let

be a linear transformation satisfying

,

and

. Then
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Question 15

Open question
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Let

and

be defined by

Consider the following statements:

:

has three zeros (counting multiplicity) in

.

:

has one zero in

. Then
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Question 16

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Let

be a non-measurable set with respect to the Lebesgue measure on

. Consider the following statements:

: If

, then

is Lebesgue measurable.

: The boundary of

has positive Lebesgue outer measure. Then
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Question 17

Open question
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For

, let

be a measurable subset of

with Lebesgue measure

. Define

Consider the following statements:

: Lebesgue measure of

is equal to zero.

: Lebesgue measure of

is equal to zero. Then
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