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TLS Online TPP Program

#Question id: 1580

Advantages of Toxoid (inactivated exotoxin) can be

#Unit 4. Cell Communication and Cell Signaling

  1. Stable; safer than live vaccines; refrigerated storage not required

  2. Immune system becomes primed to recognize bacterial toxins

  3. Strong humoral and cellular immune response; relatively inexpensive to manufacture

  4. Mimics natural infection, resulting in strong immune response

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TLS Online TPP Program

#Question id: 19093

#Unit 4. Cell Communication and Cell Signaling

Necrotrophs leads to___
a) Inhibiting pathogen growth
b) Apoptosis
c) ROS generation
d) Narrow host range
TLS Online TPP Program

#Question id: 12232

#Unit 10. Ecological Principles

White-breasted nuthatches and Downy woodpeckers both eat insects that hide in the furrows of bark in hardwood trees. The Downy woodpecker searches for insects by hunting from the bottom of the tree trunk to the top, while the White-breasted nuthatch searches from the top of the trunk down. These hunting behaviours best illustrate which of the following ecological concepts?
TLS Online TPP Program

#Question id: 5701

#Unit 8. Inheritance Biology

Cross-over suppressors are production of gametes having cross over products is lethal. Which of the following statement is incorrect?
TLS Online TPP Program

#Question id: 15458

#Unit 2. Cellular Organization

In nature, bacteria
TLS Online TPP Program

#Question id: 1374

#Unit 4. Cell Communication and Cell Signaling

Following statements are regarding to gap junctions.

i. Vertebrate gap junctions are composed of connexins, a family of structurally related transmembrane proteins with molecular weights between 26,000 and 60,000.

ii. Each vertebrate hexagonal particle consists of six noncovalently associated connexin molecules. Each individual connexin molecule has two membrane-spanning α helices with a topology similar to that of claudin.

iii. The permeability of gap junctions is regulated by posttranslational modification of connexins (e.g., phosphorylation) and is sensitive to changes in environmental conditions

such as intracellular pH and Ca2+ concentration, membrane potential, and the intercellular potential between adjacent interconnected cells (“voltage gating”).

iv. The assembly of connexins, their trafficking within cells, and the formation of functional gap junctions apparently depend on N-cadherin and its associated adapter proteins as well as desmosomal proteins.

Which of the following statements are correct?