PLEASE answer ALL THE QUESTIONS. DO NOT ANSWER IF YOU CANT ANSWER ALL OF IT. 3\'

Question

PLEASE answer ALL THE QUESTIONS. DO NOT ANSWER IF YOU CANT ANSWER ALL OF IT.

3'- GGCCTTAAGCATGCATGCAT -5'

5'- CCGGAATTC(G)TACGTACGTA -3'

1. If a replication fork is moving from right to left along this DNA structure, which strand is the lagging strand template?

a) not enough information is provided

b) top strand

2. Which of the following occurs during Metaphase I of meiotic cell division?

a) Tetrads composed of homologous chromosomes line up at the center of the cell

b) homologous chromosomes separate

c) sister chromatid pairs line up at the center of the cell

d) non-sister chromatids exchange regions of DNA

3. A gerbil is a diploid organism with 58 chromosomes. Which of the following is true?

a) a gerbil cell in G2 phase has 58 chromosomes and 116 sister chromatids

b) a gerbil cell in Prophase has 58 chromosomes and 58 sister chromatid

c) a gerbil cell in Metaphase has 58 chromosomes and 58 sister chromatid

4. At the end of elongation and during the termination of replication on the leading strand, place the following events in the correct chronological order.

I. DNA pol I synthesizes DNA

II. DNA ligase seals the nicks in the daughter DNA

III. DNA pol I removes the RNA primers

IV. DNA pol III synthesizes DNA

a) IV-III-I-II

b)I-III-IV-II

c) III-I-II-IV

5. A gene for hair color (brown vs. blond) and a gene for finger length (long vs. short) are found on two different chromosomes. If a blond haired, long fingered mother is homozygous for hair color and homozygous for finger length, what is the probability that she passes along the preference for her son to have blond hair and long fingers?

a) 0%

v) 100%

c) 25%

6. For oxytocin signaling between two neurons, what is the correct order of events?

I. an oxytocin vessicle fuses with the plasma membrane

II. an oxytocin vessicle docks with plasma membrane

III. oxytocin molecules bind to the oxytocin receptor at the plasma membrane of the receiving neuron

IV. oxytocin molecules diffuse into the synapse

a) I-III-II-IV

b) II-I-IV-III

c) I-II-III-IV

7. The independent assortment of chromosomes is due to events that occur during ______.

a) meiosis I only

b) meiosis II only

c) mitosis and meiosis II

Explanation / Answer

Q.1 - Option B.

(From Right to Left) Top strand is the lagging strand, whereas bottom strand is the leading strand.

Q.2 - Option C.

sister chromatids (not homologous chromosome) line up at the centre of the cell which is known as equitorial plate. Spindle fibre attaches to the kinetochore (bound to the centeromere).

Q.3 - Option A.

DNA replication takes place at S phase, after which the cell enters G2 phase where 58 chromosome with 116 sister chromatids is found. This number remains the same till metaphase of Mitosis.

Q.4 - Option A.

DNA primase initiate the replication by creating a strech of complementary RNA strand in the begining of leading strand. Followed by which DNA polymerase III elongates the strand till the end. Then the RNA strand is excised by DNA polymerase I and the corresponding DNA strand is synthesized by the same enzyme simultaneously. The gap between those sequence is ligated by DNA ligase.

Q.5 - Option B.

Since the gene associated with the traits are on different chromosome, independent assortment of gene takes place.

Then the mother is homozygous for both the trait.

These two condition leads to 100 % chance for her to passes along the preference for her son to have blond hair and long fingers.

Q.6 - Option B.

Durind exocytosis the oxytocin vesicle docks with the semi permeable membrane and fuse with it. This event causes the release of oxytocin into synapses. At the receivind end of the neuron you could find Oxytocin receptor at the surface of membrane where the oxytocin bind to it.

Q.7 - Option A.

Homologous chromosome separates duirng meiosis I only.

Whereas sister chromatids separates during meiosis II and Mitosis.

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