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TLS Online TPP Program

#Question id: 3787

A biochemist isolates, purifies, and combines in a test tube a variety of molecules needed for DNA replication. When she adds some DNA to the mixture, replication occurs, but each DNA molecule consists of a normal strand paired with numerous segments of DNA a few hundred nucleotides long. What has she probably left out of the mixture?

#Unit 3. Fundamental Processes

  1. DNA polymerase

  2. DNA ligase

  3. Okazaki fragments

  4. primase

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TLS Online TPP Program

#Question id: 12514

#Unit 7. System Physiology – Animal

Acute metabolic acidosis tends to _____ in intracellular K+ concentration and _____ in K+ secretion by the cortical collecting tubules.
TLS Online TPP Program

#Question id: 27975

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following set of condition During Q cycle, will favours the formation of ROS generation
(a) mitochondria are not making ATP and therefore have a large proton-motive force and a high ratio of QH2/Q
(b) mitochondria are making ATP and therefore have a large proton-motive force and a high ratio of Q/QH2 
(c) there is a high NAD/NADH ratio in the matrix
(d) there is a high NADH/NAD ratio in the matrix
TLS Online TPP Program

#Question id: 5674

#Unit 5. Developmental Biology

Following statements are regarding to the mechanism of migration of pollen tube.

A. The embryo sac is the product of three mitotic divisions of the diploid megaspore; it comprises seven cells and eight haploid nuclei.

B. The two polar nuclei in the central cell will fuse with the second sperm nucleus and produce the endosperm that will nourish the egg. The other six cells, including the egg, contain one haploid nucleus each.

C. After compatible pollen germinates, the pollen tube grows toward the micropyle.

D. The three cells from the pollen are connected to one another at the tip of the tube, and waves of sodium ions play a key role in the growth of the tube.

Which of the following combinations are correct?
TLS Online TPP Program

#Question id: 12146

#Unit 10. Ecological Principles

Which of the following is not a density-dependent factor? 
TLS Online TPP Program

#Question id: 493

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following substrates cannot contribute to net gluconeogenesis in mammalian liver?