20 questions biology

1)
 Proteins are composed of chains of _____________ which are joined together with peptide bonds.

A)
B)
C)
D)

2)
 Channels within the structure of the cell membrane are composed of

A)
B)
C)
D)

3)

 The central vacuole in a plant cell is responsible for turgor pressure. When the vacuole loses water the cytoplasm “shrinks”. When the vacuole gains water the cytoplasm seems to “puff up”. One structure helps the plant cell keep its shape no matter how much water is in the vacuole. This is the

A)
B)
C)
D)

4)
 Proteins are

A)
B)
C)
D)

5)

 The organelle identified in the picture as #10 helps the cell maintain homeostasis in what way? This organelle is the 
smallerwhite circularly shaped organelle found in the top middle of the image.

A)
B)
C)
D)

6)
 Aquatic salamanders and tadpoles obtain oxygen from water when it passes over the gill filaments.

Which condition would lead to maximum absorption of O
2 by the gills?

A)
B)
C)
D)

7)

Cell Organelles

Organelle/Part Where found Function
Cell membrane All cells Support Protection Controls movement of materials in/out of cell Barrier between cell and its environment Maintains homeostasis
Cell wall Plant, Fungi, & Bacteria, Support (grow tall) Protection
Cytoplasm All cells Supports and protects cell organelles
Nucleus All cells except prokaryotes Controls cell activities Contains the hereditary material of the cell
Mitochondria All cells except prokaryotes Site of aerobic cellular respiration
Ribosome All cells Site of protein synthesis
Chlorplast Plant cells, some prokaryotes Site of photosynthesis
Vacuole Plant and animal cells Store food, water, metabolic & toxic wastes Store large amounts of food or sugars in plants
Lysosome Common in animal cells Breaks down larger food molecules into smaller molecules Digests old cell parts
Flagella Some bacteria, protists, and animal cells Movement

 You are running on the school’s cross country team. We would expect your 
muscle cells to contain many ____________ to produce cellular energy.

A)
B)
C)
D)

8)
 Transport of materials into a cell against a concentration gradient, from low to high, requires

A)
B)
C)
D)

9)
 Which of these organic molecules functions to help speed up biological chemical reactions?

A)
B)
C)
D)

10)
 A ___________ chain is a sequence of amino acids that is the foundation for the basic structure of a protein.

A)
B)
C)
D)

11)
 Which compound is a reusable, complex protein that speeds up chemical reactions?

A)
B)
C)
D)

12)

The diagrams show different stages of cell division in the somatic cells of a plant. The stages are not shown in order. 

 Which statement correctly lists the order of the stages?

A)
B)
C)
D)

13)

 The picture shows an experimental set up for the process of osmosis.

The potato has a cavity on top, as shown in the picture. Some sugar solution is poured into the cavity and the potato is placed in a beaker of water. After some time, it is observed that there is a rise in the level of liquid in the cavity. This confirms that

A)
B)
C)
D)

14)

 The process of _____________ is modeled in the plant cell diagrams seen here.

A)
B)
C)
D)

15)

Characteristics of RNA

Student Deoxyribose Ribose Thymine Uracil
Student 1 No Yes No Yes
Student 2 Yes No No Yes
Student 3 No Yes Yes Yes
Student 4 Yes No Yes No

 Four students are asked to list characteristics of RNA in a table as part of an assignment. Which student listed the characteristics correctly?

A)
B)
C)
D)

16)
 What is the function of a cell’s selectively permeable plasma membrane?

A)
B)
C)
D)

17)

Cell Type Dichotomous Key

1a cell has a nucleus and organelles → go to # 2

1b cell has no nucleus or organelles → bacterial cell

2a cell has a cell wall → go to # 3

2b cell has no cell wall → animal cell

3a cell has chloroplasts → plant cell

3b cell has no chloroplasts → fungal cell

 What type of cell is C?

A)
B)
C)
D)

18)
 Bacteria cells have no

A)
B)
C)
D)

19)
 ___________ can be used by cells to store energy, form biological membranes, and serve as chemical messengers.

A)
B)
C)
D)

20)
 In cells, the production of proteins is handled by the ribosomes and endoplasmic reticulum, while the processing and packaging of proteins is handled by the _________ body.

A)
B)
C)
D)

 
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