The correct answer is C.
In replication, an initiator protein unwinds a short length of the DNA double helix. Next, an enzyme known as helicase attaches itself to the unwound helix and begins to break the hydrogen bonds between the base pairs of the two DNA strands, thereby pulling them apart to form a Y shape called a replication fork. The two separated strands act as templates for making the new strands of DNA.
An enzyme DNA polymerase then binds to one of the strands called the leading strand because it is the one oriented in the 3' 5' direction (towards the replication fork) and begins walking along it adding new complementary bases to it. After the new strand is proof read by DNA Polymerase, it is sealed up by DNA ligase, an enzyme specific for this task.
The other strand called the lagging strand because it faces way from the from the replication fork in 5' 3' direction also undergoes the same process with a few minor differences to produce the other new complementary strand.
The Correct answer is C: DNA opens up and each stand is used as template for a new strand
Answer:
Transport
Explanation:
Living organisms are characterized by essential day-to-day activities which they undergo to sustain their life. One of these life processes is called TRANSPORT, which involves the circulation and absorption of nutrients.
Transportation is a life process where substances synthesized or absorbed in one part of the body are carried to other parts of the body. This life process is important in plant and animals as it leads to movement of nutrient, water, mineral, gases etc. In humans, circulatory system is responsible for this process of transportation.
Answer:
Embryonic Stem cell
Explanation:
Stem cells are the multipotent cell which can give rise to a variety of other cells and can form different tissues. The stem cells are present in the embryo and the well-developed adult organism, therefore, is known as the embryonic stem cell and the adult stem cell.
In the given case, after the blastocyst stage of embryo is formed, the cells present in the inner side of the blastocyst possess the ability to form different organs and therefore are called embryonic stem cells.
Thus, embryonic stem cell is correct
Answer:
B.
Explanation:
Proteins targeted to the mitochondrial matrix are unfolded during transport and refolded within the matrix, while proteins targeted to the nucleus are fully folded in the cytoplasm before nuclear transport. So, The correct statement is B.
Proteins targeted to the mitochondrial matrix are unfolded while being inserted into the mitochondria and are refolded within the matrix. Proteins targeted to the nucleus are completely folded into the cytoplasm before they are transported to the nucleus.
- Proteins targeted to the mitochondrial matrix are indeed unfolded while being inserted into the mitochondria. This unfolding allows them to pass through the mitochondrial membranes. Once inside the mitochondrial matrix, they can be refolded into their functional conformation.
- Proteins targeted to the nucleus are typically completely folded into their functional conformation in the cytoplasm before they are transported to the nucleus. The nuclear pore complex allows folded proteins to pass through while excluding unfolded ones.
So, The correct statement is B.
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b) the Golgi apparatus; rough endoplasmic reticulum
c) ribosomes on the rough endoplasmic reticulum; Golgi apparatus
d) mitochondrial ribosomes; smooth endoplasmic reticulum
e) cytoplasmic ribosomes; plasma membrane
Answer:
c) Ribosomes on the rough endoplasmic reticulum; Golgi apparatus
Explanation:
Endoplasmic reticulum, a member of endomembrane system. If it contains ribosomes on their surface, they are called Rough Endoplasmic Reticulum (RER). RER is the site for protein synthesis.
Newly formed protein undergoes modification, one such modification is the addition of carbohydrate side chains to form glycoprotein. The protein then moves to the Golgi for modification.