Biology Exam Instructions (2024)

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Questions and Answers

What is the function of Abscissic acid in plants?

Abscissic acid functions as a growth inhibitor in plants, particularly during stress responses.

What is the role of the operator in the lac operon?

The operator is a segment of DNA where repressor proteins bind to inhibit transcription of the genes.

What does the corpus luteum degenerates into in the absence of fertilization?

The corpus luteum degenerates into a structure called corpus albicans.

What is the implication of using unsterilized needles?

Using unsterilized needles can lead to the transmission of diseases, such as AIDS. Signup and view all the answers

Why is geitonogamy considered genetically similar to autogamy?

Geitonogamy involves transfer of pollen within the same plant, leading to genetically similar offspring. Signup and view all the answers

What are the main steps in the formation of m-RNA from hn-RNA?

The main steps are capping, splicing, and polyadenylation. Signup and view all the answers

Define reproductive isolation and provide two examples of pre-mating mechanisms.

Reproductive isolation is the inability of different species to interbreed. Examples include temporal isolation (different mating seasons) and behavioral isolation (different courtship rituals). Signup and view all the answers

What are unique features of acquired immunity?

Acquired immunity is characterized by specificity and memory, allowing for a stronger response upon re-exposure to the same pathogen. Signup and view all the answers

Name two hormones secreted by ovaries and describe their functions.

Estrogen regulates female reproductive functions and promotes the development of secondary sexual characteristics, while progesterone prepares the uterus for potential pregnancy. Signup and view all the answers

What are the limitations of root pressure theory in explaining water movement in plants?

Limitations include its inability to account for water movement in tall trees and its insufficient role in transpiration. Signup and view all the answers

What are vestigial organs?

Vestigial organs are remnants of organs or structures that had a function in an early ancestor but are now nearly or entirely useless in the current organism. Signup and view all the answers

Expand the term ZIFT.

ZIFT stands for Zygote Intrafallopian Transfer. Signup and view all the answers

Which endocrine gland is prominent at birth but gets gradually atrophied in adulthood?

The thymus gland is prominent at birth but gradually atrophies in adulthood. Signup and view all the answers

What is the full form of IAA?

IAA stands for Indole-3-Acetic Acid. Signup and view all the answers

Name the microbial source of the antibiotic chloromycetin.

Chloromycetin is derived from the microorganism Streptomyces venezuelae. Signup and view all the answers

Which cells in the islets of Langerhans produce insulin?

Beta cells produce insulin in the islets of Langerhans. Signup and view all the answers

How many meiotic divisions are required for the formation of 300 seeds in angiosperms?

Two meiotic divisions are required to form 300 seeds in angiosperms. Signup and view all the answers

Explain the term emigration.

Emigration is the process of individuals leaving one location to settle in another. Signup and view all the answers

Study Notes

Biology Exam Instructions (2024)

The exam is divided into four sections.
Section A: Contains 10 multiple-choice questions (1 mark each), and 8 very short answer questions (1 mark each). Only the first attempt is graded for multiple choice.
Section B: Questions 3-14 (short answer, 2 marks each). Attempt 8.
Section C: Questions 15-26 (short answer, 3 marks each). Attempt 8.
Section D: Questions 27-31 (long answer, 4 marks each). Attempt 3.
Answers for each section should start on a new page.

Section A - Multiple Choice Questions (Example)

(i) Identify the plant growth hormone that has an inhibitory effect:
- Abscissic acid
(ii) Which of these is NOT part of the lac operon?
- Operator
(iii) In the absence of fertilization, the corpus luteum degenerates into:
- Corpus albicans
(iv) Which structure divides the nasal cavity?
- Mesethmoid cartilage
(v) Which health issue is associated with unsterilized needles
- AIDS
(vi) Recognition sequences for restriction enzymes are typically how many nucleotides long?
- 4 to 8

Section A - Very Short Answer Questions (Example)

(Specific questions from Section A are not included). These questions will be very short answer questions with only one mark allocated.

Additional Information

The exam is for Biology (Level 56)
The total marks are 70
The time allotted is 3 hours
The exam comprises 8 pages.

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Description

Prepare for your Biology exam with this comprehensive guide detailing the exam structure and question types. The exam is divided into four sections, focusing on multiple-choice, short answer, and long answer questions. Make sure to follow the instructions carefully to achieve the best results.