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Questions in biology

📝 Answered - Read the following statements regarding the features of cloning vectors. (i) The origin of replication is also responsible for controlling the copy number of the linked DNA. (ii) In addition to ori site, the vector requires selectable markers, which help in identifying and eliminating non-transformants and selectively permitting the growth of the transformants. (iii) The vector needs to have at least single recognition site for the commonly used restriction enzymes. (iv) Presence of more than one recognition sites within the vector for one restriction enzyme will generate several fragments which will facilitate the gene cloning. How many of the above statements are correct? 1 2 3 4

📝 Answered - Which cells are responsible for providing long-lasting true immunity? Any cell, product, or protein with a code different from your own and recognized by your immune system as foreign is known as an ______. Which cell makes and releases antibodies after being "sensitized"? What is the most important part about B cells becoming sensitized against an antigen and learning how to make a specific antibody? Explain naturally acquired active immunity. Explain artificially acquired active immunity. Which type of immunity is the most effective and longest lasting? Explain vaccination and how it affects immunity.

📝 Answered - In photosynthesis, what is the fate of the oxygen atoms present in CO2? A. in sugar molecules B. in sugar molecules and in water C. as molecular oxygen D. as molecular oxygen and in sugar molecules E. in water

📝 Answered - In what phase of Interphase does the DNA get replicated?

📝 Answered - Which compound is produced during regeneration? A. PGA B. G3P C. RuBP D. Rubisco

📝 Answered - LEVEL 4 Q1 How does DNA polymerase move along each strand of DNA? A. Both move towards the replication fork B. Both move away from the replication fork C. One moves towards from the replication fork and the other moves away from it D. There is only one DNA polymerase on the DNA at a time Q2 How can each copy of DNA at the end of replication be compared? A. Each copy is identical to each other B. Each copy is different from each other C. They are 90% similar D. They are 50% similar Q3 What are damages or changes to a DNA sequence called? A. Adaptations B. Carcinogens C. Mutagens D. Mutations Q4 In the event of a mismatched nucleotide, which molecule is able to backtrack, "proofread," and correct the nucleotide sequence? A. DNA Proofreadase B. DNA Polymerase C. DNA Helicase D. DNA Primase

📝 Answered - Study the given activity and answer the following questions. Gaurav removed all stamens from one flower and covered it with a polythene bag. After a week, he found that the flower had not changed into fruit, but the other flowers had changed into fruits. Questions: 1. Which process did not occur in the flower that was inside the polythene bag? 2. What other processes were stopped because of this? 3. Why did the ovary of the flower not change into fruit?

📝 Answered - The loose arrangement of reticular fibers that surround an individual muscle fiber are known as: A. operimysium B. endomysium C. deep fascia D. fasicles

📝 Answered - From the above patterns of inheritance, which of the following are exemplary for non-Mendelian inheritance? A. $2,3,4$ B. $1,2,4$ C. $1,3,4$ D. $1,2,3$

📝 Answered - If the activation energy required for a chemical reaction were reduced, what would happen to the rate of the reaction? A. The rate would increase. B. The rate would decrease. C. The rate would remain the same. D. The rate would be zero.