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TLS Online TPP Program

#Question id: 5667

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

#Unit 5. Developmental Biology

  1. The influx of bicarbonate ions (and possibly other ions) alkalinizes the sperm, raising its pH.

  2. before entering the ampulla of the oviduct, the uncapacitated sperm bind actively to the membranes of the oviduct cells in the narrow passage (the isthmus) preceding it.  This binding is temporary and appears to be broken when the sperm become capacitated.

  3. The cholesterol efflux from the sperm cell membrane is thought to change the location of its “lipid rafts,” isolated regions that often contain receptor proteins that can bind the zona pellucida and participate in the acrosome reaction.

  4. Capacitation is a transient event but translocation is not

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TLS Online TPP Program

#Question id: 15407

#Unit 8. Inheritance Biology

The end result of F factor mediated conjugation:
TLS Online TPP Program

#Question id: 15408

#Unit 8. Inheritance Biology

Which of the following is not a protein or group of proteins required for conjugation to occur?
TLS Online TPP Program

#Question id: 15409

#Unit 8. Inheritance Biology

 A heterozygous trihybrid corn plant is testcrossed and the following progeny are produced (all traits are recessive to their wildtype alternative);
          booster                              6
          booster, silkless                  137       
          booster, liguleless, silkless      291
          liguleless                          142
          liguleless, silkless                  3
          silkless                            30
          booster, liguleless                  34
          wildtype                            339
What is the order of the loci on the chromosome? 
TLS Online TPP Program

#Question id: 26801

#Unit 8. Inheritance Biology

Transduction in which any gene can be transferred from one bacterial cell to another by a virus is called
TLS Online TPP Program

#Question id: 26802

#Unit 8. Inheritance Biology

The exchange of bacterial genes clearly required direct contact, that is given by
TLS Online TPP Program

#Question id: 5323

#Unit 8. Inheritance Biology

An X-linked recessive gene produces red-green color blindness in humans. A woman with normal color vision whose father was color-blind marries a color-blind man. What is the probability that their son will be color-blind?