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TLS Online TPP Program

#Question id: 2597

How do the different types of actin-binding proteins relate to the ability of actin to form bundles and networks?

#Unit 2. Cellular Organization

  1. Proteins promoting bundle formation have one actin-binding site, whereas proteins promoting network formation have two actin-binding sites.

  2. Different types of actin bind different actin-binding proteins to form bundles or networks.

  3.  Proteins that promote bundle formation bind ADP-actin, whereas proteins that promote network formation bind ATP-actin.

  4. Proteins promoting bundle formation tend to be short and inflexible, whereas proteins that promote network formation tend to be longer and more flexible.

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TLS Online TPP Program

#Question id: 5679

#Unit 5. Developmental Biology

Following statements regarding to the molecular processes of capacitation.

A. The sperm cell membrane is altered by the removal of albumin by cholesterol in the female reproductive tract.

B. Particular proteins or carbohydrates on the sperm surface are lost during decapacitation.

C. The membrane potential of the sperm cell becomes more positive as potassium ions leave the sperm. This change in membrane potential may allow calcium channels to be opened and permit calcium to enter the sperm.

D. Calcium and bicarbonate ions are critical in activating cAMP production and in facilitating the membrane fusion events of the acrosome reaction.

E. As a result of cAMP formation, protein phosphorylation occurs. Once they are phosphorylated, some proteins migrate to the surface of the sperm head. One of these proteins is izumo, which is critical in sperm-egg fusion.

which one of the following combinations is correct?
TLS Online TPP Program

#Question id: 10834

#Unit 10. Ecological Principles

Which of the following is not an example of symbiosis?
TLS Online TPP Program

#Question id: 4322

#Unit 3. Fundamental Processes

If a particular operon encodes enzymes for making an essential amino acid and is regulated like the trp operon, then
TLS Online TPP Program

#Question id: 28159

#Unit 1. Molecules and their Interaction Relevant to Biology

The given plot and statement are made after performing the DST calorimetry of a protein

a. X represents perfect folding of protein

b. X represents breaking of a bond

c. Y represents perfect folding of protein

d. Y represents perfect breaking of a bond

Which of the following is correct
TLS Online TPP Program

#Question id: 7308

#Unit 5. Developmental Biology

In Arabidopsis thaliana, the transition to flowering involves multiple factors, pathways and meristem identity genes. Following statements regarding to the mechanism and function of meristem identity genes.

 A. FT mRNA is expressed in companion cells of the leaf vein in response to multiple signals, including day length, light quality, and temperature.

 B. The FT–FD complex activates AP1 in the inflorescence meristem and SOC1 in the floral meristem, which triggers LFY gene expression.

 C. LFY and AP1 trigger expression of the floral homeotic genes.

 D. FLC acts as a negative regulator of SOC1 in the meristem and as a negative regulator of FT in the leaves.

 Which of the following is incorrect?