Biology Test 129

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Biology Test 129

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Weekly Quiz Competition

Question 1
4 / -1

Besides being selectively permeable, plasma membrane of eukaryotes also functions in

A
Electron transport chain reactions

B
Synthesis of ATP through chemiosmosis.

C
Providing rigidity to the cell.

D
Providing free permeability to K^+, Na⁺and chlorine ions.

Solution

The electron transport chain is a series of proteins and organic molecules found in the inner membrane of the mitochondria. Electrons are passed from one member of the transport chain to another in a series of redox reactions. The energy released in these reactions is captured as a proton gradient, which is then used to make ATP in a process called chemiosmosis. Together, the electron transport chain and chemiosmosis make up oxidative phosphorylation.

Hence, the correct option is (B).
Question 2
4 / -1

Which human chromosome is the result of fusion of two ancestral ape chromosomes?

A
Chromosome X

B
Chromosome 2

C
Chromosome Y

D
Chromosome 1

Solution

It turns out that chromosome 2, which is unique to the human lineage of evolution, emerged as a result of the head-to-head fusion of two ancestral chromosomes that remain separate in other primates. Three genetic indicators provide strong, if not conclusive, evidence of fusion. Fusion and marks the point at which two ancestral ape chromosomes fused to give rise to human chromosome 2.

Hence, the correct option is (B).
Question 3
4 / -1

Ovules arise from the placenta. In which of the following is one ovule present in an ovary?

(a). Paddy

(b). Papaya

(c). Watermelon

(d). Mango

A
Only (a) and (b)

B
Only (a) and (c)

C
Only (a) and (d)

D
Only (b) and (c)

Solution

Single embryo sac is found in an ovule developing from single megaspore, except the case of polyembryony.

Number of ovules present in an ovary depends on the plant species. Some plants have single ovule in an ovary such as mango, wheat, rice , etc. While some plants have many ovules in an ovary such as Hibisus, pea ,etc.

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

A compound X isolated from Streptomyces pimprina is used for its Y property. What are X and Y?

A
Hamycin, antifungal

B
Hamycin, antibacterial

C
Bacitracin, antibacterial

D
Griseofulvin, antifungal

Solution

Hamycin is a pair of polyene antimycotic organic compounds described in India. It is a heptaene antifungal compound rather similar in chemical structure to amphotericin B except that it has an additional aromatic group bonded to the molecule.

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

Paneth cells are found in:

A
Crypts of Lieberkuhn

B
Peyer's patches

C
Islet of Langerhans

D
Gastric glands

Solution

Paneth cells are highly specialized secretory epithelial cells located in the small intestinal crypts of Lieberkühn. The dense granules produced by Paneth cells contain an abundance of antimicrobial peptides and immunomodulating proteins that function to regulate the composition of the intestinal flora.

Hence, the correct option is (A).
Question 6
4 / -1

The stage of development at which implantation occurs in human female is:

A
Morula

B
Zygote

C
Blastocyst

D
Neurula

Solution

In humans, implantation occurs during the mid-secretory phase, between cycle days (CD) 20 and 24, or 6–10 days after ovulation (Blesa et al. 2014; Donaghay and Lessey 2007; Psychoyos 1973), which is a temporally framed period called the window of implantation (WOI). At this stage of prenatal development, the concept is called a blastocyst.

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

Which of the following statements is/are false?

(a). The growth of the roots and stems in length with the help of apical meristem is called primary growth.

(b). In the young stem, the meristematic layer is present in patches as a single layer outside the xylem.

(c). In dicot stems, the cells of cambium present between primary xylem and primary phloem is the intrafascicular cambium.

A
Only (a)

B
Only (a) and (b)

C
Only (b)

D
Only (b) and (c)

Solution

The meristematic layer that is responsible for cutting off vascular tissues – xylem and pholem – is called vascular cambium. In the young stem it is present in patches as a single layer between the xylem and phloem.

Hence, the correct option is (C).
Question 8
4 / -1

The term 'sarcode' was coined by

A
Robert Hooke

B
Robert Brown

C
Durjarden

D
Purkinje

Solution

Protoplasm or living matter is a polyphasic crystallo-colloidal complex that possesses all the properties of life and is found inside living cells. It was called a sarcode by Dujarden in 1835. The term protoplasm was coined by Purkinje in 1839.

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

Which of the following substances transported is placed under wrong conducting tissue?

Xylem Phloem

Water Organic Solute

Hormone Nitrogen

Salts Inorganic solute

A
Water

B
Nitrogen

C
Salts

D
Inorganic solute

Solution

Hormones are chemical messengers that travel throughout the body coordinating complex processes like growth, metabolism, and fertility. They can influence the function of the immune system, and even alter behavior.

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

Which of the following statements is true about complementary DNA (cDNA)?

A
It is the "other strand" of a DNA.

B
It does not need any template for its synthesis.

C
It is the base sequence of the vector DNA.

D
It is produced by reverse transcription.

Solution

Complementary DNA (cDNA) is a DNA copy of a messenger RNA (mRNA) molecule produced by reverse transcriptase, a DNA polymerase that can use either DNA or RNA as a template, a process termed reverse transcription. A reverse transcriptase (RT) is an enzyme used to generate complementary DNA (cDNA) from an RNA template.

Hence, the correct option is (D).

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Xylem	Phloem
Water	Organic Solute
Hormone	Nitrogen
Salts	Inorganic solute

Biology Test 129

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Biology Test 129

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SHARING IS CARING

Question 1

Electron transport chain reactions

Synthesis of ATP through chemiosmosis.

Providing rigidity to the cell.

Providing free permeability to K+, Na+ and chlorine ions.

Solution

Question 2

Chromosome X

Chromosome 2

Chromosome Y

Chromosome 1

Solution

Question 3

Only (a) and (b)

Only (a) and (c)

Only (a) and (d)

Only (b) and (c)

Solution

Question 4

Hamycin, antifungal

Hamycin, antibacterial

Bacitracin, antibacterial

Griseofulvin, antifungal

Solution

Question 5

Crypts of Lieberkuhn

Peyer's patches

Islet of Langerhans

Gastric glands

Solution

Question 6

Morula

Zygote

Blastocyst

Neurula

Solution

Question 7

Only (a)

Only (a) and (b)

Only (b)

Only (b) and (c)

Solution

Question 8

Robert Hooke

Robert Brown

Durjarden

Purkinje

Solution

Question 9

Water

Nitrogen

Salts

Inorganic solute

Solution

Question 10

It is the "other strand" of a DNA.

It does not need any template for its synthesis.

It is the base sequence of the vector DNA.

It is produced by reverse transcription.

Solution

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Providing free permeability to K^+, Na⁺and chlorine ions.