Biology Test 149

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Biology Test 149

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Weekly Quiz Competition

Question 1
4 / -1

After medical examination, the doctor confirmed that Mr. Bansal is suffering from chronic renal disease. Which of the following statements is incorrect about patients with chronic renal disease?

A
Erythropoietin levels are usually lowered.

B
Anemia is a common problem.

C
Erythropoietin can be given to treat the anemia.

D
Erythropoietin is usually given as oral tablets.

Solution

Erythropoietin can be used to correct anemia by stimulating red blood cell production in the bone marrow in these conditions. The medication is known as epoetin alfa (Epogen, Procrit) or as darbepoietin alfa (Arnesp). It can be given as an injection intravenously (into a vein) or subcutaneously (under the skin).
Hence, the correct option is (D).
Question 2
4 / -1

The outer layer in the cranium that prevents brain from mechanical shocks is known as __________.

A
Cerebrospinal fluid

B
Dura mater

C
Pia mater

D
None of these

Solution

Dura mater is a thick membrane made of dense irregular connective tissue that surrounds the brain and spinal cord. It is the outermost of the three layers of membrane called the meninges that protect the central nervous system. The other two meningeal layers are the arachnoid mater and the pia mater.
Hence, the correct option is (B).
Question 3
4 / -1

Suraj observed that the petals of moonflower close during the day when there is bright sunlight, but open up at night when it is dark. This movement is an example of

A
Thigmonasty

B
Geotropism

C
Hydrotropism

D
Photonasty

Solution

Photonasty is the tendency in certain plant species to respond to light by developing sufficient cellular force or growth on one side of an axis to change the form or position of the axis, as in the opening and closing of the flowers of four-o'clock.

Hence the correct option is (D).
Question 4
4 / -1

Neonatal myasthenia gravis is thought to be caused by

A
An inherited genetic defect

B
Transplacental transfer of maternal IgG against the TSH receptor

C
Anti-idiotype to maternal IgG

D
Transplacental transfer of maternal IgG against the acetylcholine receptor

Solution

The syndrome of neonatal myasthenia is caused by transplacental transfer of maternal IgG against the acetylcholine receptor (AChR). Infants affected by this condition are floppy at birth, and they display poor sucking, muscle tone, and respiratory effort.

Hence, the correct option is (D).
Question 5
4 / -1

Which of the following is a sexually transmitted disease caused by ectoparasite?

A
Enterobiasis

B
Candidiasis

C
Scabies

D
Giardiasis

Solution

Scabies usually is spread by direct, prolonged, skin-to-skin contact with a person who has scabies. Contact generally must be prolonged; a quick handshake or hug usually will not spread scabies. Scabies is spread easily to sexual partners and household members. Scabies in adults frequently is sexually acquired.
Hence, the correct option is (C).
Question 6
4 / -1

What do you mean by a hypostatic gene?

A
A gene in which mutation occurs

B
A gene whose phenotype remains unaltered

C
A gene whose genotype is altered or suppressed

D
A gene whose phenotype is altered or suppressed

Solution

A hypostatic gene is one whose phenotype is altered by the expression of an allele at a separate locus, in an epistasis event. Example: In labrador retrievers, the chocolate coat colour is a result of homozygosity for a gene that is epistatic to the "black vs. brown" gene.

Hence, the correct option is (D)
Question 7
4 / -1

Which of the following statements is/are false?

a. Each parent possesses a number of pairs of genes for each characteristic on a pair of chromosomes.

b. In the inheritance of more than one pair of traits in a cross simultaneously, the factors responsible for each pair of traits are distributed independently to the gametes.

c. The characteristics of an organism are determined by internal factors that occur in pairs as only one of the pairs of such factors can be present in a single gamete.

A
Only a

B
Both a and b

C
Only b

D
Only c

Solution

One chromosome of each homologous pair comes from the mother (called a maternal chromosome) and one comes from the father (paternal chromsosome). Homologous chromosomes are similiar but not identical. Each carries the same genes in the same order, but the alleles for each trait may not be the same.
Hence, the correct option is (A).
Question 8
4 / -1

______ is not present in the prokaryotes.

A
Ribosome

B
Nuclear envelope

C
Cell membrane

D
None of these

Solution

Prokaryotic cells lack membrane bound organelles and well organized nucleus, that is nuclear envelope is absent in these cells. The nuclear envelope, also known as the nuclear membrane, a bilayer membranes which surrounds the nucleus, and in eukaryotic cells it encases the genetic material.

Hence, the correct option is (B).
Question 9
4 / -1

Who demonstrated that photosynthesis is essentially a light-dependent reaction in which hydrogen from a suitable oxidisable compound reduces carbon dioxide?

A
Cornelius van Niel

B
T. W. Engelmann

C
Julius von Sachs

D
Jan Ingenhousz

Solution

Cornelius van Neil demonstrated that photosynthesis is essentially a light-dependent reaction in which hydrogen from a suitable oxidizable compound reduces carbon dioxide to carbohydrates.

Hence, the correct option is (A).
Question 10
4 / -1

One of the reasons why some people cough after eating a meal may be due to the improper movement of ______

A
Larynx

B
Diaphragm

C
Neck

D
Epiglottis

Solution

If a person suddenly starts coughing while swallowing food, it is due to improper movement of the epiglottis.

The epiglottis is a leaf-shaped flap of cartilage located behind the tongue, at the top of the larynx, or voice box. The main function of the epiglottis is to seal off the windpipe during eating, so that food is not accidentally inhaled.

Hence, the correct option is (D).

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Biology Test 149

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Biology Test 149

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SHARING IS CARING

Question 1

Erythropoietin levels are usually lowered.

Anemia is a common problem.

Erythropoietin can be given to treat the anemia.

Erythropoietin is usually given as oral tablets.

Solution

Question 2

Cerebrospinal fluid

Dura mater

Pia mater

None of these

Solution

Question 3

Thigmonasty

Geotropism

Hydrotropism

Photonasty

Solution

Question 4

An inherited genetic defect

Transplacental transfer of maternal IgG against the TSH receptor

Anti-idiotype to maternal IgG

Transplacental transfer of maternal IgG against the acetylcholine receptor

Solution

Question 5

Enterobiasis

Candidiasis

Scabies

Giardiasis

Solution

Question 6

A gene in which mutation occurs

A gene whose phenotype remains unaltered

A gene whose genotype is altered or suppressed

A gene whose phenotype is altered or suppressed

Solution

Question 7

Only a

Both a and b

Only b

Only c

Solution

Question 8

Ribosome

Nuclear envelope

Cell membrane

None of these

Solution

Question 9

Cornelius van Niel

T. W. Engelmann

Julius von Sachs

Jan Ingenhousz

Solution

Question 10

Larynx

Diaphragm

Neck

Epiglottis

Solution

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