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DAT BIOLOGY QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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DAT BIOLOGY QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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DAT BIOLOGY QUESTIONS ANDANSWERS WITH SOLUTIONS 2024
Cell Theory: - ANSWER 1. all living things are composed of cells
2. cell is the basic fundamental unit of life
3. chemical reactions of life take place inside the cell
4. cells arise from pre-existing cells
5. cells carry genetic information in the form of DNA - passed from parent to daughter cell
nucleolus - ANSWER - dense structure in the nucleus where ribosomal RNA synthesis occurs
Endoplasmic Reticulum - ANSWER - network of membrane- enclosed spaces invloved in the transport of
materials throughout the cell, particularly those materials destined to be secreted by the cell
Golgi Apparatus - ANSWER - receives vesicles and their contents from the smooth ER, modifies them,
repackages them into vesicles and distributes them to the cell surface by exocytosis
Mitochondria - ANSWER - power house of the cell
- ATP synthesis
Cyclosis - ANSWER - streaming movement of the cytoplasm within the cell
Vacuole - ANSWER - membrane bound sacs, transport and storage of materials that are ingested,
secreted, processes or digested by the cell
centrioles - ANSWER - microtubule involved in spindle organization during cell division, not bound by a
membrane
- PLANT CELLS DO NOT CONTAIN CENTRIOLES
Lysosome - ANSWER - membrane bound vesicles
- contain hydrolytic enzymes
,- cellular digestion
Cytoskeleton - ANSWER - composed of microtubules and microfilaments
- gives cell mechanical support
- maintains shape
- functions in cell motility
Microtubules - ANSWER - hollow rods of tubulin
- support, provide framework for organelle movement
- cilia and flagella- specialized arrangements of microtubules
Microfilaments - ANSWER - solid rods of actin
- cell movement and support
- move material across plasma membrane ( contraction phase of cell division, amoeboid movement)
Brownian Movement - ANSWER - kinetic energy spreads small suspended particles throughout the
cytoplasm of cell
Intracellular circulation: - ANSWER - Brownian movement
- cyclosis/ streaming
- ER
Extracellular Transport - ANSWER - Diffusion
- Circulatory system
Interphase - ANSWER - growth, chromosome replication
- cell spends 90% of time here
- after replication, chromosomes consist of two identical sister chromatids held together at centromere
- individual chromosomes are not visible
, - DNA is uncoiled (chromatin)
- G1, S, G2
G1 - ANSWER - active growth phase
- cell size increases
- protein synthesis
S phase - ANSWER - DNA synthesis
G2 - ANSWER - cell prepares to divide
- grows and synthesizes proteins
Karyokinesis - ANSWER - nuclear division
Cytokinesis - ANSWER - Cellular division
Prophase - ANSWER - chromosomes condense
- centriole pairs separate and move to opposite poles
-spindle forms
- nuclear membrane dissolves
Metaphase - ANSWER - centriole pairs are at opposite poles
- fibers of spindle attach to chromatid and kinetochore
- spindle fibers align the chromosomes in the middle (METAPHASE PLATE)
Anaphase - ANSWER - centromeres split, each chromatid has own centromere- sister chromatids
separate
- sister chromatids pulled to opposite poles- shortening spindle fibers
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