(iii) A cloning vector does not have a selectable marker. How will it affect the process of cloning?
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Solution and Explanation
- Without a selectable marker, it becomes difficult to distinguish between recombinant and non-recombinant cells.
- Additional screening methods, such as PCR or DNA sequencing, are needed, which increases time and cost.
Top Questions on Origin Of Life
- Match List I with List II:Choose the correct answer from the options given below:
List I
List II
A Mesozoic Era I Lower invertebrates B Proterozoic Era II Fish & Amphibia C Cenozoic Era III Birds & Reptiles D Paleozoic Era IV Mammals - NEET (UG) - 2024
- Biology
- Origin Of Life
- Read the following passage and answer the questions that follow:
“Mosquitoes are drastically affecting human health in almost all the developing tropical countries. Different species of mosquitoes cause very fatal diseases so much so that many humans lose their lives, and if they survive, they are unable to put in productive hours to sustain their life. As a result, the health index of the country goes down.”
(a) Name the form in which Plasmodium gains entry into:
(i) The human body
(ii) The female Anopheles body
- CBSE CLASS XII - 2024
- Biology
- Origin Of Life
- (c) State any 3 reasons for which these types of animals are being produced.
- CBSE CLASS XII - 2024
- Biology
- Origin Of Life
- How does latitude influence the species richness of an ecosystem?
- CBSE CLASS XII - 2024
- Biology
- Origin Of Life
- Which component was not found in the early Earth's atmosphere?
- MHT CET - 2024
- Biology
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Questions Asked in CBSE CLASS XII exam
A bacteria sample of a certain number of bacteria is observed to grow exponentially in a given amount of time. Using the exponential growth model, the rate of growth of this sample of bacteria is calculated. The differential equation representing the growth is:
\[ \frac{dP}{dt} = kP, \] where \( P \) is the bacterial population.
Based on this, answer the following:
- CBSE CLASS XII - 2024
- Differentiability
Self-study helps students to build confidence in learning. It boosts the self-esteem of the learners. Recent surveys suggested that close to 50% learners were self-taught using internet resources and upskilled themselves. A student may spend 1 hour to 6 hours in a day upskilling self. The probability distribution of the number of hours spent by a student is given below:
\[ P(X = x) = \begin{cases} kx^2 & {for } x = 1, 2, 3, \\ 2kx & {for } x = 4, 5, 6, \\ 0 & {otherwise}. \end{cases} \]
Based on the above information, answer the following:
- CBSE CLASS XII - 2024
- Probability Distribution
A scholarship is a sum of money provided to a student to help him or her pay for education. Some students are granted scholarships based on their academic achievements, while others are rewarded based on their financial needs.
Every year a school offers scholarships to girl children and meritorious achievers based on certain criteria. In the session 2022–23, the school offered monthly scholarships of ₹3,000 each to some girl students and ₹4,000 each to meritorious achievers in academics as well as sports.
In all, 50 students were given the scholarships, and the monthly expenditure incurred by the school on scholarships was ₹1,80,000.
Based on the above information, answer the following questions:
- Using integration, find the area of the region enclosed between the curve \( y = \sqrt{4 - x^2} \), and the lines \( x = -1 \), \( x = 1 \), and the \( x \)-axis.
- CBSE CLASS XII - 2024
- Integration
- The perimeter of a rectangular metallic sheet is 300 cm. It is rolled along one of its sides to form a cylinder. Find the dimensions of the rectangular sheet so that the volume of the cylinder so formed is maximum.
- CBSE CLASS XII - 2024
- Absolute maxima and Absolute minima