Unit 1
Water
Water
What is the term for the attraction of water molecules to other water molecules?
Cohesion
A polymer of beta-D-glucose found in plants 1,4 linkages with hydrogen bonds to other chains of beta-D-glucose which molecule fits this description?
Cellulose
What are pyrimidines in DNA?
Types of bases
What effect do changes in pH have on enzymes?
Extreme pH can alter the active site of all enzymes
Which organism has DNA located in three organelles?
a Fern
Which properties explain the ability of water to dissolve solutes?
1. polarity of water molecules
2. high specific heat capacity of water
3. hydrogen bonding
1 and 3 only
Blood is a water-based transport medium. Which property of water makes it a good transport medium?
versatility as a solvent
Which base is connected to its complementary base in a base pair by 3 hydrogen bonds?
Guanine
Living organisms control pH within their tissues. What is a reason for regulating pH?
Many reactions can only happen at specific pH levels.
What feature of both striated muscle and aseptate fungal hyphae is different from typical cell structure?
They have multiple nuclei within a structural unit
What is property of water?
Water molecules are highly cohesive which is important for transport in xylem.
Which property of water
accounts for its moderating effects on the Earth's atmosphere!
Thermal
The sequence of nucleotides in a section of DNA is: GCCATACGATCG What is the base sequence of the DNA complimentary strand?
CGGTATGCTAGC
What best describes how ice would impact the reaction rate?
It would slow down the catalase to decrease the probability of contact with the hydrogen peroxide molecules
A certain specialized cell contains an unusually large amount of rough ER. What functions is this cell type most likely specialized to perform?
the production and secretion of proteins
What is the benefit to living organisms that water has a high specific heat capacity?
Aquatic environments do not have a great fluctuation in their temperature.
Which statements correctly explain properties of water?
1. Water is a useful medium for metabolic reactions as many substances dissolve in water.
II. Water is useful as a coolant as it takes a small amount of heat energy to change its temperature.
III. Water molecules are cohesive which helps water transport in the roots and stems of plants
I and III only
The percentage of thymine in the DNA of an organism is approximately 30% what is the percentage of guanine?
20%
How does an increase in temperature accent the enzyme activity?
Movement of molecules- increases
Chance of collision between enzyme and substrate-increases
The direct measurement of the nucleus in the picture of the cell, is 19 mn. If the image is magnified 2000 times. What is the maximum diameter of the nucleus in the cell labeled X?
10 nm
Which planetary body is believed to be responsible for the water found on earth?
Asteroids
Someone do their best impression of Mrs. Malach!
dangggg spot onnnnn
What is bonded to phosphates in a strand of RNA?
Which molecule is found in both DNA and RNA?
only carbohydrates
Phosphate
What is denaturation?
AND
What is an effect of protein denaturation?
a structural change in a protein that results in a loss of its biological properties
The three-dimensional structure of the protein is altered.
Which sequence shows increasing relative size? Smallest -> largest
eukaryotic cell
bacterium
virus
bacterium, virus, eukaryotic cell