Practice Questions

TLS Online TPP Program

#Question id: 1369

The following statements are made with reference to characteristics of glycosaminoglycans and proteoglycans, which are major constituents of extracellular matrix. Which one of them is incorrect?

#Unit 4. Cell Communication and Cell Signaling

Glycosaminoglycans are long linear polymers of specific repeating disaccharides. Usually one sugar is either a uronic acid or d-galactose; the other sugar is N-acetylglucosamine or N-acetylgalactosamine.
Proteoglycan core proteins are synthesized in the endoplasmic reticulum, and the GAG chains are assembled on and covalently attached to these cores in the Golgi complex.
All GAG chains are elongated by the alternating addition of sugar monomers to form the disaccharide repeats characteristic of a particular GAG; the chains are often modified subsequently by the covalent linkage of small molecules such as sulfate.
The ratio of polysaccharide to protein in all proteoglycans is much lower than that in most other glycoproteins.

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TLS Online TPP Program

#Question id: 7296

#Unit 5. Developmental Biology

some of the following statements regarding to this experiment are given below. Which of the following statements is incorrect?

TLS Online TPP Program

#Question id: 7300

#Unit 5. Developmental Biology

Following genes regulate flowering, column I represents genes, column II represents transcription factor family and column III represents functions.

Column I	Column II	Column III
A. FLOWERING D (FD)	i. bZIP	a. Activates flowering downstream of florigen
B. SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 (SOC1)	ii. MADS	b. Receptor for florigen
C. FLOWERING LOCUS C		c. Class E homeotic genes
D. SEPALLATA (SEP)		d. Floral repressor

Which of the following is correct?

TLS Online TPP Program

#Question id: 22944

#Unit 5. Developmental Biology

In the floral meristem, the FT-FD complex activates the expression of

TLS Online TPP Program

#Question id: 22938

#Unit 5. Developmental Biology

Genes that regulate flowering, have different transcription factors and functions:

Gene	Transcription Factor Family	Functions
1. CONSTANS (CO)	i- bHLH	P- Activates flowering in response to long photoperiods
2. FLOWERING D (FD)	ii- Zinc finger	Q- Receptor for florigen, activates flowering via AP1
3. PHYTOCHROME INTERACTING FACTOR4 (PIF4)	iii- bZIP	R- Activates florigen in response to high temperature
4. FLOWERING LOCUS C	iv- MADS	S- Floral repressor

Choose correct match:

TLS Online TPP Program

#Question id: 7314

#Unit 5. Developmental Biology

With reference to plant flowering pattern; match the terms of Column I with the most appropriate term of Column II. (Se-Sepal; Ca-Carpel; St-stamen; Pe-Petal)

s.no.	Homeotic mutants (Column 1)	S. No	Flower patterning (Column 2)
A.	Apetala2 mutant	I.	Ca-Ca-Ca-Ca
B.	Agamous /Apetala3 mutant	II.	Se-Pe-Pe-Se
C.	Agamous mutant	III.	Se-Se-Se-Se
D.	Apetala2/Apetala3 mutant	IV.	Ca-St-St-Ca

TLS Online TPP Program

#Question id: 7312

#Unit 5. Developmental Biology

Following statements regarding to the classes of genes that regulate floral development:

A. Floral organ identity genes directly control floral identity. The proteins encoded by these genes are transcription factors that likely control the expression of other genes whose products are involved in the formation and/or function of floral organs.

B. Cadastral genes act as spatial regulators of the floral organ identity genes by setting boundaries for their expression.

C. Meristem identity genes are necessary for the initial induction of the organ identity genes. These genes are the positive regulators of floral organ identity.

D. Cadastral genes act as negative regulators of the floral organ identity genes by inhibits their expression.

E. Meristem identity genes are the negative regulators of floral organ identity genes.

Which of the above statements are true?