Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 6913
TLS Online TPP Program

#Question id: 10132

Which of the following statements would be correct for photophosphorylation ?

#Unit 6. System Physiology – Plant
  1. Water is oxidized and protons are released in the lumen by PSII and reduces NADP+ to NADPH in the stroma both are spontaneous processes becoz their reduction potential is positive
  2. The sequential absorption of four photons (excitons) —known as S states, each absorption causing the loss of one electron from the Mn4Ca cluster, produces an oxidizing agent that can remove four electrons from two molecules of water, producing O2, the electrons lost from the Mn4Ca cluster pass one at a time to an oxidized Tyr residue in a PSII protein, then to P680+
  3. An alternative path of electron is cyclic electron transfer, in which elctron move from ferredoxin back to the cytochrome b6 f complex, the cyclic pathway produces more ATP and Water produces but less NADPH produces than the noncyclic
  4. Transfer of the two electrons to PQB reduces it to PQB 2–, and the reduced PQB 2– takes two protons from the stroma side of the medium, yielding a fully reduced plastohydroquinone (PQH2), the PQH2 then still remain bounded from the reaction center complex
More Questions
TLS Online TPP Program

#Question id: 5666

#Unit 5. Developmental Biology

 When the extracellular side of the receptor binds resact, it activates latent guanylyl cyclase in the cytoplasmic side of the receptor. Active guanylyl cyclase causes the sperm cell to produce more cyclic GMP (cGMP), this compound_____
TLS Online TPP Program

#Question id: 5667

#Unit 5. Developmental Biology

There may be an important connection between sperm translocation and capacitation. Which of the following option is correct explanation of above statement?
TLS Online TPP Program

#Question id: 5668

#Unit 5. Developmental Biology

Following statements are made in relation to the five widely recognized stages of Arabidopsis embryogenesis:

A. The fusion of haploid egg and sperm takes place in zygotic stage

B. Rapid cell division in two regions on either side of the future shoot apex forms globular stage

C. The cell elongation throughout the embryo axis and further development result in Torpedo stage

D. The embryo loses water and becomes metabolically inactive in the torpedo stage

Which combination of the above statements is correct?
TLS Online TPP Program

#Question id: 5669

#Unit 5. Developmental Biology

What is the reproductive difference between sea urchins and mammals is?
TLS Online TPP Program

#Question id: 5670

#Unit 5. Developmental Biology

Embryonic stem cells can be induced in the laboratory to differentiate into muscle, nerve, pancreatic, and other specialized cell types. It has recently become possible to trigger the dedifferentiation of somatic cells back into pluripotent cells (so-called induced pluripotent stem cells or iPS cells) by artificially enhancing the production of a relatively small number of key transcriptional factors known to be required for maintenance of pluripotency. Examples of such transcription factors are OCT4 and NANOG. The production of OCT4 and NANOG (and other key regulatory proteins) is stimulated by a transcription factor known as FOXP1, a member of the Forkhead family of DNA-binding proteins. There are two isoforms of FOXP1.

Which of the following statement regarding to FOXP1 is incorrect?
TLS Online TPP Program

#Question id: 5671

#Unit 5. Developmental Biology

Match the following mechanism of polyspermy (Column I) with events (Column II).

 Column I

 Column II

A. Fast block to polyspermy

i. chemicals from the fusing sperm cytoplasm alter the sodium ion (Na+) channels on the membrane

B. Slow block to polyspermy

ii. enzyme cortical granule serine

protease, cleaves the protein posts that connect the vitelline envelope

iii the concentration of free Ca2+ in the egg cytoplasm increases

iv. an electric change in the egg cell membrane

v. the concentration of free Na+ in the egg cytoplasm increases

Which of the following is correct?